--- ./nx-X11/lib/X11/MaskEvent.c.X.original	2015-02-13 14:03:44.620443950 +0100
+++ ./nx-X11/lib/X11/MaskEvent.c	2015-02-10 19:13:12.944718089 +0100
@@ -75,5 +75,10 @@
 	    if (prev && prev->qserial_num != qe_serial)
 		/* another thread has snatched this event */
 		prev = NULL;
+#ifdef NX_TRANS_SOCKET
+            if (_XGetIOError(dpy)) {
+                return 0;
+            }
+#endif
 	}
 }
