diff --git a/senseApis/xcbWindow/xcbWindow.cpp b/senseApis/xcbWindow/xcbWindow.cpp
index 70b92b6..6167096 100644
--- a/senseApis/xcbWindow/xcbWindow.cpp
+++ b/senseApis/xcbWindow/xcbWindow.cpp
@@ -283,8 +283,15 @@ static void xcbWindow_attachDeviceReq(
 	// Not used yet, but may be used later.
     (void)componentThread;
 
-    g_attachedWindows.emplace_back(
-        std::make_unique<xcb_window::AttachedWindow>(desc));
+	try {
+		g_attachedWindows.emplace_back(
+			std::make_unique<xcb_window::AttachedWindow>(desc));
+	} catch (const std::exception& exc) {
+		std::cerr << __func__ << ": Exception while attaching X11 window: "
+			<< exc.what() << "\n";
+		cb.callbackFn(false, desc);
+		return;
+	}
 
     std::cout << __func__ << ": Attached X11 window:\n  "
         << g_attachedWindows.back()->stringify()