diff --git a/app/src/parser.c b/app/src/parser.c
index dfb87034..0048f4e2 100644
--- a/app/src/parser.c
+++ b/app/src/parser.c
@@ -447,6 +447,17 @@ __Z_INLINE parser_error_t parser_getTextualItem(const parser_context_t *ctx,
     container.screen.expert = false;
     CHECK_PARSER_ERR(parser_getScreenInfo(ctx, &container, displayIdx))
 
+    if (container.screen.titlePtr != NULL && container.screen.contentPtr == NULL) {\
+        if (!strncmp(container.screen.titlePtr, "Chain id", container.screen.titleLen)){
+            if(!strncmp(container.screen.contentPtr, "0", container.screen.contentLen) ||
+               !strncmp(container.screen.contentPtr, "1", container.screen.contentLen)) {
+                return parser_unexpected_chain;
+         }
+     }
+    }
+
+
+
     if (!app_mode_expert()) {
         CHECK_PARSER_ERR(parser_getNextNonExpert(ctx, &container, displayIdx))
     }
diff --git a/app/src/tx_display.c b/app/src/tx_display.c
index e1829da2..e220b981 100644
--- a/app/src/tx_display.c
+++ b/app/src/tx_display.c
@@ -131,6 +131,9 @@ __Z_INLINE parser_error_t calculate_is_default_chainid() {
         // If we don't match the default chainid, switch to expert mode
         display_cache.is_default_chain = true;
         zemu_log_stack("DEFAULT Chain ");
+    } else if (strcmp(outVal, "0") == 0 || strcmp(outVal, "1") == 0) {
+        zemu_log_stack("Not Allowed chain");
+        return parser_unexpected_chain;
     } else {
         zemu_log_stack("Chain is NOT DEFAULT");
     }
diff --git a/tests/tx_parse.cpp b/tests/tx_parse.cpp
index 94dba4e9..f4c7b2aa 100644
--- a/tests/tx_parse.cpp
+++ b/tests/tx_parse.cpp
@@ -127,7 +127,7 @@ namespace {
     }
 
     TEST(TxParse, Count_Minimal) {
-        auto transaction = R"({"account_number":"0"})";
+        auto transaction = R"({"account_number":"3"})";
 
         parser_tx_obj.tx_json.tx = transaction;
         parser_tx_obj.tx_json.flags.cache_valid = false;
@@ -140,6 +140,19 @@ namespace {
         EXPECT_EQ(1, numItems) << "Wrong number of items";
     }
 
+    TEST(TxParse, Tx_Chain_not_Allowed) {
+        auto transaction = R"({"account_number":"0","chain_id":"0","fee":{"amount":[{"amount":"5","denom":"photon"}],"gas":"10000"},"memo":"testmemo","msgs":[{"inputs":[{"address":"cosmosaccaddr1d9h8qat5e4ehc5","coins":[{"amount":"10","denom":"atom"}]}],"outputs":[{"address":"cosmosaccaddr1da6hgur4wse3jx32","coins":[{"amount":"10","denom":"atom"}]}]}],"sequence":"1"})";
+
+        parser_tx_obj.tx_json.tx = transaction;
+        parser_tx_obj.tx_json.flags.cache_valid = false;
+        parser_error_t err = JSON_PARSE(&parser_tx_obj.tx_json.json, parser_tx_obj.tx_json.tx);
+        EXPECT_EQ(err, parser_ok);
+
+        uint8_t numItems;
+        parser_error_t err2 = tx_display_numItems(&numItems);
+        EXPECT_EQ(err2, parser_unexpected_chain);
+    }
+
     TEST(TxParse, Tx_Page_Count) {
         auto transaction = R"({"account_number":"0","chain_id":"test-chain-1","fee":{"amount":[{"amount":"5","denom":"photon"}],"gas":"10000"},"memo":"testmemo","msgs":[{"inputs":[{"address":"cosmosaccaddr1d9h8qat5e4ehc5","coins":[{"amount":"10","denom":"atom"}]}],"outputs":[{"address":"cosmosaccaddr1da6hgur4wse3jx32","coins":[{"amount":"10","denom":"atom"}]}]}],"sequence":"1"})";