diff --git a/src/adapter/threads.ts b/src/adapter/threads.ts
index 2846e04da..33dc6f853 100644
--- a/src/adapter/threads.ts
+++ b/src/adapter/threads.ts
@@ -957,6 +957,7 @@ export class Thread implements IVariableStoreLocationProvider {
         // and an instrumentation pause in step out should not be possible.
         if (expectedPauseReason.direction === StepDirection.In) {
           // no-op
+          debugger;
         } else {
           return this._cdp.Debugger.resume({});
         }