Commit: 2476faebd751fe7a250d7a496a1f56338b83d4e9
Author: Julian Eisel
Date:   Wed Sep 21 14:47:40 2016 +0200
Branches: master
https://developer.blender.org/rB2476faebd751fe7a250d7a496a1f56338b83d4e9

Fix crash in space context cycling when leaving window bounds

===================================================================

M       source/blender/editors/screen/screen_ops.c

===================================================================

diff --git a/source/blender/editors/screen/screen_ops.c 
b/source/blender/editors/screen/screen_ops.c
index 7612dbc..a6b6ccd 100644
--- a/source/blender/editors/screen/screen_ops.c
+++ b/source/blender/editors/screen/screen_ops.c
@@ -4191,7 +4191,8 @@ static EnumPropertyItem space_context_cycle_direction[] = 
{
 static int space_context_cycle_poll(bContext *C)
 {
        ScrArea *sa = CTX_wm_area(C);
-       return ELEM(sa->spacetype, SPACE_BUTS, SPACE_USERPREF);
+       /* sa might be NULL if called out of window bounds */
+       return (sa && ELEM(sa->spacetype, SPACE_BUTS, SPACE_USERPREF));
 }
 
 /**

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