Check whether debugger is running before trying to read a message hea…

…der (#16368)
jupyterlab · May 24, 2024 · 144a5e8 · 144a5e8
1 parent fb2aff9
commit 144a5e8
Showing 1 changed file with 3 additions and 3 deletions.
diff --git a/packages/debugger/src/handler.ts b/packages/debugger/src/handler.ts
@@ -150,10 +150,10 @@ export class DebuggerHandler implements DebuggerHandler.IHandler {
       msg: KernelMessage.IIOPubMessage
     ): void => {
       if (
-        (msg.parent_header as KernelMessage.IHeader).msg_type ==
-          'execute_request' &&
         this._service.isStarted &&
-        !this._service.hasStoppedThreads()
+        !this._service.hasStoppedThreads() &&
+        (msg.parent_header as KernelMessage.IHeader).msg_type ===
+          'execute_request'
       ) {
         void this._service.displayDefinedVariables();
       }