Issue with ShulkerSDK not returning game ID and failing to find available server after retry

[Andrei965]

What happened?

I'm running a Shulker Kubernetes cluster and have implemented a custom matchmaking microservice in Kotlin. I'm using the ShulkerSDK to allocate a server, calling the following method:

val shulkerSDK = ShulkerSDKImpl.createFromEnvironment()
println(shulkerSDK.allocateFromFleet("flagwars", "lobby", true).get())

The issue I'm facing is that while the code successfully creates the game server, it doesn't return the game ID as expected. Instead, it throws an error. Additionally, when I run the code again, it fails to find an available server, even though a server exists with its game state set to "ready."

What components are involved in your issue?

Operator, Server Agent (Minestom)

Version

v0.11.0

Kubernetes Version

Client Version: v1.30.5 Kustomize Version: v5.0.4-0.20230601165947-6ce0bf390ce3 Server Version: v1.31.0

Relevant log output

Matchmaker error
Error during gRPC call: INTERNAL: failed to summon game server: Error deserializing response: invalid type: null, expected a sequence at line 1 column 5633
io.grpc.StatusRuntimeException: INTERNAL: failed to summon game server: Error deserializing response: invalid type: null, expected a sequence at line 1 column 5633
 at io.grpc.Status.asRuntimeException(Status.java:533)
 at io.grpc.stub.ClientCalls$UnaryStreamToFuture.onClose(ClientCalls.java:538)
 at io.grpc.internal.DelayedClientCall$DelayedListener$3.run(DelayedClientCall.java:489)
 at io.grpc.internal.DelayedClientCall$DelayedListener.delayOrExecute(DelayedClientCall.java:453)
 at io.grpc.internal.DelayedClientCall$DelayedListener.onClose(DelayedClientCall.java:486)
 at io.grpc.internal.ClientCallImpl.closeObserver(ClientCallImpl.java:564)
 at io.grpc.internal.ClientCallImpl.access$100(ClientCallImpl.java:72)
 at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl$1StreamClosed.runInternal(ClientCallImpl.java:729)
 at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl$1StreamClosed.runInContext(ClientCallImpl.java:710)
 at io.grpc.internal.ContextRunnable.run(ContextRunnable.java:37)
 at io.grpc.internal.SerializingExecutor.run(SerializingExecutor.java:133)
 at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
 at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
 at java.base/java.lang.Thread.run(Thread.java:1583)

Shulker operator logs
{"timestamp":"2024-12-31T16:53:44.446071Z","level":"WARN","fields":{"message":"{\"apiVersion\":\"agones.dev/v1\",\"kind\":\"GameServer\",\"metadata\":{\"annotations\":{\"agones.dev/sdk-version\":\"1.45.0\",\"minecraftserver.shulkermc.io/tags\":\"lobby\"},\"creationTimestamp\":\"2024-12-31T16:53:44Z\",\"finalizers\":[\"agones.dev/controller\"],\"generateName\":\"lobby-\",\"generation\":1,\"labels\":{\"agones.dev/fleet\":\"lobby\",\"app.kubernetes.io/component\":\"minecraft-server\",\"app.kubernetes.io/instance\":\"minecraft-server-lobby\",\"app.kubernetes.io/managed-by\":\"shulker-operator\",\"app.kubernetes.io/name\":\"minecraft-server\",\"app.kubernetes.io/part-of\":\"cluster-flagwars\",\"minecraftcluster.shulkermc.io/name\":\"flagwars\",\"minecraftserverfleet.shulkermc.io/name\":\"lobby\"},\"managedFields\":[{\"apiVersion\":\"agones.dev/v1\",\"fieldsType\":\"FieldsV1\",\"fieldsV1\":{\"f:metadata\":{\"f:annotations\":{\".\":{},\"f:minecraftserver.shulkermc.io/tags\":{}},\"f:generateName\":{},\"f:labels\":{\".\":{},\"f:agones.dev/fleet\":{},\"f:app.kubernetes.io/component\":{},\"f:app.kubernetes.io/instance\":{},\"f:app.kubernetes.io/managed-by\":{},\"f:app.kubernetes.io/name\":{},\"f:app.kubernetes.io/part-of\":{},\"f:minecraftcluster.shulkermc.io/name\":{},\"f:minecraftserverfleet.shulkermc.io/name\":{}},\"f:ownerReferences\":{\".\":{},\"k:{\\\"uid\\\":\\\"c998f93e-20c3-42c8-8d3c-04815594c321\\\"}\":{}}},\"f:spec\":{\".\":{},\"f:eviction\":{\".\":{},\"f:safe\":{}},\"f:health\":{\".\":{},\"f:disabled\":{},\"f:failureThreshold\":{},\"f:initialDelaySeconds\":{},\"f:periodSeconds\":{}},\"f:immutableReplicas\":{},\"f:ports\":{},\"f:template\":{\".\":{},\"f:metadata\":{\".\":{},\"f:annotations\":{\".\":{},\"f:kubectl.kubernetes.io/default-container\":{},\"f:minecraftserver.shulkermc.io/tags\":{}},\"f:labels\":{\".\":{},\"f:app.kubernetes.io/component\":{},\"f:app.kubernetes.io/instance\":{},\"f:app.kubernetes.io/managed-by\":{},\"f:app.kubernetes.io/name\":{},\"f:app.kubernetes.io/part-of\":{},\"f:minecraftcluster.shulkermc.io/name\":{},\"f:minecraftserverfleet.shulkermc.io/name\":{}}},\"f:spec\":{\".\":{},\"f:containers\":{},\"f:initContainers\":{},\"f:restartPolicy\":{},\"f:serviceAccountName\":{},\"f:subdomain\":{},\"f:volumes\":{}}}}},\"manager\":\"shulker-operator\",\"operation\":\"Update\",\"time\":\"2024-12-31T16:53:44Z\"}],\"name\":\"lobby-lhbxk\",\"namespace\":\"flagwars\",\"ownerReferences\":[{\"apiVersion\":\"agones.dev/v1\",\"controller\":true,\"kind\":\"Fleet\",\"name\":\"lobby\",\"uid\":\"c998f93e-20c3-42c8-8d3c-04815594c321\"}],\"resourceVersion\":\"23835\",\"uid\":\"cb0a58e9-9975-4304-b5e4-1746128adfdf\"},\"spec\":{\"container\":\"minecraft-server\",\"eviction\":{\"safe\":\"OnUpgrade\"},\"health\":{\"failureThreshold\":5,\"initialDelaySeconds\":30,\"periodSeconds\":15},\"immutableReplicas\":1,\"scheduling\":\"Packed\",\"sdkServer\":{\"grpcPort\":9357,\"httpPort\":9358,\"logLevel\":\"Info\"},\"template\":{\"metadata\":{\"annotations\":{\"kubectl.kubernetes.io/default-container\":\"minecraft-server\",\"minecraftserver.shulkermc.io/tags\":\"lobby\"},\"creationTimestamp\":null,\"labels\":{\"app.kubernetes.io/component\":\"minecraft-server\",\"app.kubernetes.io/instance\":\"minecraft-server-lobby\",\"app.kubernetes.io/managed-by\":\"shulker-operator\",\"app.kubernetes.io/name\":\"minecraft-server\",\"app.kubernetes.io/part-of\":\"cluster-flagwars\",\"minecraftcluster.shulkermc.io/name\":\"flagwars\",\"minecraftserverfleet.shulkermc.io/name\":\"lobby\"}},\"spec\":{\"containers\":[{\"env\":[{\"name\":\"SHULKER_SERVER_NAME\",\"valueFrom\":{\"fieldRef\":{\"fieldPath\":\"metadata.name\"}}},{\"name\":\"SHULKER_SERVER_NAMESPACE\",\"valueFrom\":{\"fieldRef\":{\"fieldPath\":\"metadata.namespace\"}}},{\"name\":\"SHULKER_NETWORK_ADMINS\",\"value\":\"172f6616-74b8-475b-89fc-c8edbb57d9b3\"},{\"name\":\"SHULKER_SERVER_LIFECYCLE_STRATEGY\",\"value\":\"AllocateWhenNotEmpty\"},{\"name\":\"EULA\",\"value\":\"TRUE\"},{\"name\":\"COPY_CONFIG_DEST\",\"value\":\"/data\"},{\"name\":\"SYNC_SKIP_NEWER_IN_DESTINATION\",\"value\":\"true\"},{\"name\":\"SKIP_SERVER_PROPERTIES\",\"value\":\"true\"},{\"name\":\"REPLACE_ENV_IN_PLACE\",\"value\":\"true\"},{\"name\":\"REPLACE_ENV_VARIABLE_PREFIX\",\"value\":\"CFG_\"},{\"name\":\"CFG_VELOCITY_FORWARDING_SECRET\",\"valueFrom\":{\"secretKeyRef\":{\"key\":\"key\",\"name\":\"flagwars-forwarding-secret\"}}},{\"name\":\"MEMORY\"},{\"name\":\"JVM_XX_OPTS\",\"value\":\"-XX:MaxRAMPercentage=75\"},{\"name\":\"TYPE\",\"value\":\"CUSTOM\"},{\"name\":\"CUSTOM_SERVER\",\"value\":\"http://host.docker.internal:8080/FlagWarsLobby.jar\"}],\"image\":\"itzg/minecraft-server:2024.7.2-java21\",\"imagePullPolicy\":\"IfNotPresent\",\"name\":\"minecraft-server\",\"ports\":[{\"containerPort\":25565,\"name\":\"minecraft\"}],\"resources\":{},\"securityContext\":{\"allowPrivilegeEscalation\":false,\"capabilities\":{\"drop\":[\"ALL\"]},\"readOnlyRootFilesystem\":true,\"runAsNonRoot\":true,\"runAsUser\":1000},\"volumeMounts\":[{\"mountPath\":\"/config\",\"name\":\"server-config\"},{\"mountPath\":\"/data\",\"name\":\"server-data\"},{\"mountPath\":\"/tmp\",\"name\":\"server-tmp\"}]}],\"initContainers\":[{\"command\":[\"sh\",\"/mnt/shulker/config/init-fs.sh\"],\"env\":[{\"name\":\"SHULKER_CONFIG_DIR\",\"value\":\"/mnt/shulker/config\"},{\"name\":\"SHULKER_SERVER_CONFIG_DIR\",\"value\":\"/config\"},{\"name\":\"SHULKER_SERVER_DATA_DIR\",\"value\":\"/data\"},{\"name\":\"SHULKER_VERSION_CHANNEL\",\"value\":\"Minestom\"}],\"image\":\"alpine:latest\",\"name\":\"init-fs\",\"resources\":{},\"securityContext\":{\"allowPrivilegeEscalation\":false,\"capabilities\":{\"drop\":[\"ALL\"]},\"readOnlyRootFilesystem\":true,\"runAsNonRoot\":true,\"runAsUser\":1000},\"volumeMounts\":[{\"mountPath\":\"/mnt/shulker/config\",\"name\":\"shulker-config\",\"readOnly\":true},{\"mountPath\":\"/config\",\"name\":\"server-config\"}]}],\"restartPolicy\":\"Never\",\"serviceAccountName\":\"shulker-flagwars-server\",\"subdomain\":\"flagwars-cluster\",\"volumes\":[{\"configMap\":{\"name\":\"lobby-config\"},\"name\":\"shulker-config\"},{\"emptyDir\":{},\"name\":\"server-config\"},{\"emptyDir\":{},\"name\":\"server-data\"},{\"emptyDir\":{},\"name\":\"server-tmp\"}]}}},\"status\":{\"address\":\"\",\"addresses\":null,\"eviction\":{\"safe\":\"OnUpgrade\"},\"immutableReplicas\":1,\"nodeName\":\"\",\"players\":null,\"ports\":null,\"reservedUntil\":null,\"state\":\"Creating\"}}\n, Error(\"invalid type: null, expected a sequence\", line: 1, column: 5633)"},"target":"kube_client::client"}

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[Andrei965]

Hello! The issue seems to be in the shulker-operator code. I am using grpcui to send an allocation request directly, and I am getting the same error

• with summonIfNeeded = true: Internal (13) failed to summon game server: Error deserializing response: invalid type: null, expected a sequence at line 1 column 5633
• with summonIfNeeded = false: ResourceExhausted (8) no game server available for fleet lobby in namespace flagwars

[Andrei965]

Hello! I have also checked the agones-allocator logs, and found this:
http: TLS handshake error from 10.244.0.240:55348: tls: first record does not look like a TLS handshake

[Andrei965]

The previous error was because, by default, the agones allocators expects the request to be TSL. You have to set the helm values agones.allocator.disableMTLS and agones.allocator.disableTLS to true. But now, there is a new error in the agones allocator:
ERROR: Failed to extract ServerMetadata from context
I even tried adding some test fields to the custom_annotations filed, but the error still appears.

[Andrei965]

Hi! It turns out the issue was on my end. The problem was from the Agones allocator being configured to use both REST and gRPC on the same port. For some reason, HTTP took priority, causing an error to be returned to the Shulker operator, even though the request was made via gRPC. Once I disabled the HTTP server on the allocator, everything started working as expected.

[Andrei965]

Hi! I thought the issue was fixed, but it isn't. When no server is available, and the summonIfNeeded parameter is true, the shulker sdk gives the following error:
Error processing match: io.grpc.StatusRuntimeException: INTERNAL: failed to summon game server: Error deserializing response: invalid type: null, expected a sequence at line 1 column 5691
In the shulker-operator, I get the same error:
{"timestamp":"2025-01-06T15:42:45.247420Z","level":"WARN","fields":{"message":"{\"apiVersion\":\"agones.dev/v1\",\"kind\":\"GameServer\",\"metadata\":{\"annotations\":{\"agones.dev/sdk-version\":\"1.45.0\",\"matchData\":\"{\\\"gameType\\\":\\\"DUO\\\",\\\"mapName\\\":null,\\\"teams\\\":[]}\",\"minecraftserver.shulkermc.io/tags\":\"game\"},\"creationTimestamp\":\"2025-01-06T15:42:45Z\",\"finalizers\":[\"agones.dev/controller\"],\"generateName\":\"game-\",\"generation\":1,\"labels\":{\"agones.dev/fleet\":\"game\",\"app.kubernetes.io/component\":\"minecraft-server\",\"app.kubernetes.io/instance\":\"minecraft-server-game\",\"app.kubernetes.io/managed-by\":\"shulker-operator\",\"app.kubernetes.io/name\":\"minecraft-server\",\"app.kubernetes.io/part-of\":\"cluster-flagwars\",\"minecraftcluster.shulkermc.io/name\":\"flagwars\",\"minecraftserverfleet.shulkermc.io/name\":\"game\"},\"managedFields\":[{\"apiVersion\":\"agones.dev/v1\",\"fieldsType\":\"FieldsV1\",\"fieldsV1\":{\"f:metadata\":{\"f:annotations\":{\".\":{},\"f:matchData\":{},\"f:minecraftserver.shulkermc.io/tags\":{}},\"f:generateName\":{},\"f:labels\":{\".\":{},\"f:agones.dev/fleet\":{},\"f:app.kubernetes.io/component\":{},\"f:app.kubernetes.io/instance\":{},\"f:app.kubernetes.io/managed-by\":{},\"f:app.kubernetes.io/name\":{},\"f:app.kubernetes.io/part-of\":{},\"f:minecraftcluster.shulkermc.io/name\":{},\"f:minecraftserverfleet.shulkermc.io/name\":{}},\"f:ownerReferences\":{\".\":{},\"k:{\\\"uid\\\":\\\"9f647fb4-1e52-4e40-af61-6feeead2af3c\\\"}\":{}}},\"f:spec\":{\".\":{},\"f:eviction\":{\".\":{},\"f:safe\":{}},\"f:health\":{\".\":{},\"f:disabled\":{},\"f:failureThreshold\":{},\"f:initialDelaySeconds\":{},\"f:periodSeconds\":{}},\"f:immutableReplicas\":{},\"f:ports\":{},\"f:template\":{\".\":{},\"f:metadata\":{\".\":{},\"f:annotations\":{\".\":{},\"f:kubectl.kubernetes.io/default-container\":{},\"f:minecraftserver.shulkermc.io/tags\":{}},\"f:labels\":{\".\":{},\"f:app.kubernetes.io/component\":{},\"f:app.kubernetes.io/instance\":{},\"f:app.kubernetes.io/managed-by\":{},\"f:app.kubernetes.io/name\":{},\"f:app.kubernetes.io/part-of\":{},\"f:minecraftcluster.shulkermc.io/name\":{},\"f:minecraftserverfleet.shulkermc.io/name\":{}}},\"f:spec\":{\".\":{},\"f:containers\":{},\"f:initContainers\":{},\"f:restartPolicy\":{},\"f:serviceAccountName\":{},\"f:subdomain\":{},\"f:volumes\":{}}}}},\"manager\":\"shulker-operator\",\"operation\":\"Update\",\"time\":\"2025-01-06T15:42:45Z\"}],\"name\":\"game-dtxpj\",\"namespace\":\"flagwars\",\"ownerReferences\":[{\"apiVersion\":\"agones.dev/v1\",\"controller\":true,\"kind\":\"Fleet\",\"name\":\"game\",\"uid\":\"9f647fb4-1e52-4e40-af61-6feeead2af3c\"}],\"resourceVersion\":\"86877\",\"uid\":\"d79f5d88-60b0-431c-b5dc-50119389bd41\"},\"spec\":{\"container\":\"minecraft-server\",\"eviction\":{\"safe\":\"OnUpgrade\"},\"health\":{\"failureThreshold\":5,\"initialDelaySeconds\":30,\"periodSeconds\":15},\"immutableReplicas\":1,\"scheduling\":\"Packed\",\"sdkServer\":{\"grpcPort\":9357,\"httpPort\":9358,\"logLevel\":\"Info\"},\"template\":{\"metadata\":{\"annotations\":{\"kubectl.kubernetes.io/default-container\":\"minecraft-server\",\"minecraftserver.shulkermc.io/tags\":\"game\"},\"creationTimestamp\":null,\"labels\":{\"app.kubernetes.io/component\":\"minecraft-server\",\"app.kubernetes.io/instance\":\"minecraft-server-game\",\"app.kubernetes.io/managed-by\":\"shulker-operator\",\"app.kubernetes.io/name\":\"minecraft-server\",\"app.kubernetes.io/part-of\":\"cluster-flagwars\",\"minecraftcluster.shulkermc.io/name\":\"flagwars\",\"minecraftserverfleet.shulkermc.io/name\":\"game\"}},\"spec\":{\"containers\":[{\"env\":[{\"name\":\"SHULKER_SERVER_NAME\",\"valueFrom\":{\"fieldRef\":{\"fieldPath\":\"metadata.name\"}}},{\"name\":\"SHULKER_SERVER_NAMESPACE\",\"valueFrom\":{\"fieldRef\":{\"fieldPath\":\"metadata.namespace\"}}},{\"name\":\"SHULKER_NETWORK_ADMINS\",\"value\":\"172f6616-74b8-475b-89fc-c8edbb57d9b3\"},{\"name\":\"SHULKER_SERVER_LIFECYCLE_STRATEGY\",\"value\":\"Manual\"},{\"name\":\"EULA\",\"value\":\"TRUE\"},{\"name\":\"COPY_CONFIG_DEST\",\"value\":\"/data\"},{\"name\":\"SYNC_SKIP_NEWER_IN_DESTINATION\",\"value\":\"true\"},{\"name\":\"SKIP_SERVER_PROPERTIES\",\"value\":\"true\"},{\"name\":\"REPLACE_ENV_IN_PLACE\",\"value\":\"true\"},{\"name\":\"REPLACE_ENV_VARIABLE_PREFIX\",\"value\":\"CFG_\"},{\"name\":\"CFG_VELOCITY_FORWARDING_SECRET\",\"valueFrom\":{\"secretKeyRef\":{\"key\":\"key\",\"name\":\"flagwars-forwarding-secret\"}}},{\"name\":\"MEMORY\"},{\"name\":\"JVM_XX_OPTS\",\"value\":\"-XX:MaxRAMPercentage=75\"},{\"name\":\"TYPE\",\"value\":\"CUSTOM\"},{\"name\":\"CUSTOM_SERVER\",\"value\":\"http://host.docker.internal:8080/FlagWarsGame.jar\"}],\"image\":\"itzg/minecraft-server:2024.7.2-java21\",\"imagePullPolicy\":\"IfNotPresent\",\"name\":\"minecraft-server\",\"ports\":[{\"containerPort\":25565,\"name\":\"minecraft\"}],\"resources\":{},\"securityContext\":{\"allowPrivilegeEscalation\":false,\"capabilities\":{\"drop\":[\"ALL\"]},\"readOnlyRootFilesystem\":true,\"runAsNonRoot\":true,\"runAsUser\":1000},\"volumeMounts\":[{\"mountPath\":\"/config\",\"name\":\"server-config\"},{\"mountPath\":\"/data\",\"name\":\"server-data\"},{\"mountPath\":\"/tmp\",\"name\":\"server-tmp\"}]}],\"initContainers\":[{\"command\":[\"sh\",\"/mnt/shulker/config/init-fs.sh\"],\"env\":[{\"name\":\"SHULKER_CONFIG_DIR\",\"value\":\"/mnt/shulker/config\"},{\"name\":\"SHULKER_SERVER_CONFIG_DIR\",\"value\":\"/config\"},{\"name\":\"SHULKER_SERVER_DATA_DIR\",\"value\":\"/data\"},{\"name\":\"SHULKER_VERSION_CHANNEL\",\"value\":\"Minestom\"}],\"image\":\"alpine:latest\",\"name\":\"init-fs\",\"resources\":{},\"securityContext\":{\"allowPrivilegeEscalation\":false,\"capabilities\":{\"drop\":[\"ALL\"]},\"readOnlyRootFilesystem\":true,\"runAsNonRoot\":true,\"runAsUser\":1000},\"volumeMounts\":[{\"mountPath\":\"/mnt/shulker/config\",\"name\":\"shulker-config\",\"readOnly\":true},{\"mountPath\":\"/config\",\"name\":\"server-config\"}]}],\"restartPolicy\":\"Never\",\"serviceAccountName\":\"shulker-flagwars-server\",\"subdomain\":\"flagwars-cluster\",\"volumes\":[{\"configMap\":{\"name\":\"game-config\"},\"name\":\"shulker-config\"},{\"emptyDir\":{},\"name\":\"server-config\"},{\"emptyDir\":{},\"name\":\"server-data\"},{\"emptyDir\":{},\"name\":\"server-tmp\"}]}}},\"status\":{\"address\":\"\",\"addresses\":null,\"eviction\":{\"safe\":\"OnUpgrade\"},\"immutableReplicas\":1,\"nodeName\":\"\",\"players\":null,\"ports\":null,\"reservedUntil\":null,\"state\":\"Creating\"}}\n, Error(\"invalid type: null, expected a sequence\", line: 1, column: 5691)"},"target":"kube_client::client"}
In the agones-allocator:

2025-01-06T15:42:44.951Z | {"message":"allocation request received.","request":{"namespace":"flagwars","metadata":{"annotations":{"matchData":"{\"gameType\":\"DUO\",\"mapName\":null,\"teams\":[]}"}},"gameServerSelectors":[{"matchLabels":{"minecraftserverfleet.shulkermc.io/name":"game"}}]},"severity":"info","source":"main","time":"2025-01-06T15:42:44.950972285Z"}
2025-01-06T15:42:45.232Z | {"error":"Could not find an Allocatable GameServer","gsa":{"metadata":{"namespace":"flagwars","creationTimestamp":null},"spec":{"multiClusterSetting":{"policySelector":{}},"required":{},"selectors":[{"matchLabels":{"minecraftserverfleet.shulkermc.io/name":"game"},"gameServerState":"Ready"}],"scheduling":"Packed","metadata":{"annotations":{"matchData":"{\"gameType\":\"DUO\",\"mapName\":null,\"teams\":[]}"}}},"status":{"state":"","gameServerName":"","source":""}},"gsaKey":"flagwars/","message":"Failed to Allocated. Retrying...","severity":"warning","source":"*gameserverallocations.Allocator","time":"2025-01-06T15:42:45.232554606Z"}

[Andrei965]

Hi @jeremylvln,
I've been working on fixing this issue for the past week, but unfortunately haven't had any success so far. I suspect the problem might be related to missing fields when the game server is creating, which could be causing the deserialization error.
Would you mind taking a look when you have a chance? Thanks in advance!

[jeremylvln]

Hi @Andrei965! Thanks for pinging me, I've totally forgot about your issue. I'll manage to take a look this week :)