callstack fix npe

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

@@ -73,8 +73,8 @@ export class CallStackView extends ViewletPanel {
 			// Only show the global pause message if we do not display threads.
 			// Otherwise there will be a pause message per thread and there is no need for a global one.
 			const sessions = this.debugService.getModel().getSessions();
-			if (sessions.length === 1 && sessions[0].getAllThreads().length === 1) {
-				const thread = sessions[0].getAllThreads()[0];
+			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;
 				dom.toggleClass(this.pauseMessageLabel, 'exception', thread.stoppedDetails.reason === 'exception');