Index: /trunk/src/VBox/GuestHost/OpenGL/state_tracker/state_diff.c
===================================================================
--- /trunk/src/VBox/GuestHost/OpenGL/state_tracker/state_diff.c	(revision 78401)
+++ /trunk/src/VBox/GuestHost/OpenGL/state_tracker/state_diff.c	(revision 78402)
@@ -623,5 +623,5 @@
 void crStateSwitchPrepare(CRContext *toCtx, CRContext *fromCtx, GLuint idDrawFBO, GLuint idReadFBO)
 {
-    PCRStateTracker pState = toCtx->pStateTracker ? toCtx->pStateTracker : fromCtx->pStateTracker;
+    PCRStateTracker pState = toCtx ? toCtx->pStateTracker : fromCtx->pStateTracker;
 
     CRASSERT(pState);
@@ -641,5 +641,5 @@
 void crStateSwitchPostprocess(CRContext *toCtx, CRContext *fromCtx, GLuint idDrawFBO, GLuint idReadFBO)
 {
-    PCRStateTracker pState = toCtx->pStateTracker ? toCtx->pStateTracker : fromCtx->pStateTracker;
+    PCRStateTracker pState = toCtx ? toCtx->pStateTracker : fromCtx->pStateTracker;
 
     CRASSERT(pState);