fixes #63416

src/vs/workbench/parts/debug/electron-browser/callStackView.ts

@@ -74,8 +74,8 @@ export class CallStackView extends ViewletPanel {
 			const sessions = this.debugService.getModel().getSessions();
 			const thread = sessions.length === 1 && sessions[0].getAllThreads().length === 1 ? sessions[0].getAllThreads()[0] : undefined;
 			if (thread && thread.stoppedDetails) {
-				this.pauseMessageLabel.textContent = thread.stoppedDetails.description || nls.localize('debugStopped', "Paused on {0}", thread.stoppedDetails.reason);
-				this.pauseMessageLabel.title = thread.stoppedDetails.text;
+				this.pauseMessageLabel.textContent = thread.stoppedDetails.description || nls.localize('debugStopped', "Paused on {0}", thread.stoppedDetails.reason || '');
+				this.pauseMessageLabel.title = thread.stoppedDetails.text || '';
 				dom.toggleClass(this.pauseMessageLabel, 'exception', thread.stoppedDetails.reason === 'exception');
 				this.pauseMessage.hidden = false;
 			} else {