diff --git a/src/kits/interface/Window.cpp b/src/kits/interface/Window.cpp
index 37a17a1425..8f23137408 100644
--- a/src/kits/interface/Window.cpp
+++ b/src/kits/interface/Window.cpp
@@ -2043,7 +2043,14 @@ BWindow::Show()
 {
 	if (!fRunCalled) {
 		// this is the fist time Show() is called, which implicetly runs the looper
-		Run();
+		if (fLink->SenderPort() < B_OK) {
+			// We don't have valid app_server connection; there is no point
+			// in starting our looper
+			fRunCalled = true;
+			fTaskID = B_ERROR;
+			return;
+		} else
+			Run();
 	}
 
 	if (Lock()) {
diff --git a/src/tests/servers/app/stress_test/main.cpp b/src/tests/servers/app/stress_test/main.cpp
index aa292f8f5c..5281f1f173 100644
--- a/src/tests/servers/app/stress_test/main.cpp
+++ b/src/tests/servers/app/stress_test/main.cpp
@@ -104,6 +104,9 @@ TestWindow::TestWindow(BRect frame)
 	BMessenger self(this);
 	BMessage message(B_QUIT_REQUESTED);
 	fPulse = new BMessageRunner(self, &message, 10000000, 1);
+
+	if (Thread() < B_OK)
+		Quit();
 }