diff --git a/daffodil-runtime1/src/main/scala/org/apache/daffodil/runtime1/debugger/InteractiveDebugger.scala b/daffodil-runtime1/src/main/scala/org/apache/daffodil/runtime1/debugger/InteractiveDebugger.scala
index e51462160a..4e50ca10c9 100644
--- a/daffodil-runtime1/src/main/scala/org/apache/daffodil/runtime1/debugger/InteractiveDebugger.scala
+++ b/daffodil-runtime1/src/main/scala/org/apache/daffodil/runtime1/debugger/InteractiveDebugger.scala
@@ -355,8 +355,8 @@ class InteractiveDebugger(
         // Most errors are coming back here as RSDE because that's what they get upconverted into.
         // Most expression problems are considered SDE.
         //
-        case _: RuntimeSchemaDefinitionError => {
-          state.setSuccess()
+        case e: RuntimeSchemaDefinitionError => {
+          state.suppressDiagnosticAndSucceed(e)
           false
         }
       }
diff --git a/daffodil-runtime1/src/main/scala/org/apache/daffodil/runtime1/dsom/SDE.scala b/daffodil-runtime1/src/main/scala/org/apache/daffodil/runtime1/dsom/SDE.scala
index 16ca935563..145bccb3a7 100644
--- a/daffodil-runtime1/src/main/scala/org/apache/daffodil/runtime1/dsom/SDE.scala
+++ b/daffodil-runtime1/src/main/scala/org/apache/daffodil/runtime1/dsom/SDE.scala
@@ -71,6 +71,7 @@ class RelativePathPastRootError(schemaContext: SchemaFileLocation, kind: String,
 
 class RuntimeSchemaDefinitionError(
   schemaContext: SchemaFileLocation,
+  causedBy: Throwable,
   fmtString: String,
   args: Any*
 ) extends SchemaDefinitionError(
@@ -80,7 +81,16 @@ class RuntimeSchemaDefinitionError(
     args: _*
   ) {
 
+  def this(
+    schemaContext: SchemaFileLocation,
+    fmtString: String,
+    args: Any*
+  ) =
+    this(schemaContext, null, fmtString, args: _*)
+
   override def modeName = "Runtime Schema Definition"
+
+  override def getCause: Throwable = causedBy
 }
 
 class RuntimeSchemaDefinitionWarning(
diff --git a/daffodil-runtime1/src/main/scala/org/apache/daffodil/runtime1/processors/parsers/ParseErrors.scala b/daffodil-runtime1/src/main/scala/org/apache/daffodil/runtime1/processors/parsers/ParseErrors.scala
index a6f0876192..0540839a46 100644
--- a/daffodil-runtime1/src/main/scala/org/apache/daffodil/runtime1/processors/parsers/ParseErrors.scala
+++ b/daffodil-runtime1/src/main/scala/org/apache/daffodil/runtime1/processors/parsers/ParseErrors.scala
@@ -141,7 +141,11 @@ trait DoSDEMixin {
       }
       case other => {
         val sde =
-          new RuntimeSchemaDefinitionError(state.getContext().schemaFileLocation, e.getMessage)
+          new RuntimeSchemaDefinitionError(
+            state.getContext().schemaFileLocation,
+            e,
+            e.getMessage
+          )
         state.setFailed(sde)
         state.toss(sde)
       }