Index: subsystems/win32/win32k/ntuser/msgqueue.c
===================================================================
--- subsystems/win32/win32k/ntuser/msgqueue.c	(revision 53860)
+++ subsystems/win32/win32k/ntuser/msgqueue.c	(working copy)
@@ -110,6 +110,9 @@
     PWND pWnd;
 
     pti = PsGetCurrentThreadWin32Thread();
+    if (!pti)
+        return (HCURSOR)0;
+
     MessageQueue = pti->MessageQueue;
 
     /* Get the screen DC */