diff --git a/packages/framework-core/src/services/graphql/websocket-protocol/graphql-websocket-protocol.ts b/packages/framework-core/src/services/graphql/websocket-protocol/graphql-websocket-protocol.ts
index 6a2925879..1ea477dae 100644
--- a/packages/framework-core/src/services/graphql/websocket-protocol/graphql-websocket-protocol.ts
+++ b/packages/framework-core/src/services/graphql/websocket-protocol/graphql-websocket-protocol.ts
@@ -67,7 +67,7 @@ export class GraphQLWebsocketHandler {
           return await this.handleTerminate(envelope.connectionID)
         default:
           // This branch should be impossible, but just in case
-          throw new Error(`Unknown message type. Message=${clientMessage}`)
+          throw new Error(`Unknown message type. Message=${JSON.stringify(clientMessage)}`)
       }
     } catch (e) {
       const error = e as Error