Commit: cc1372546ad5d05047a80251739d2aab9485b8f1
Author: Jeroen Bakker
Date:   Tue Jul 1 19:43:52 2014 +0200
https://developer.blender.org/rBcc1372546ad5d05047a80251739d2aab9485b8f1

Fix for segmentation fault in pipeline (freestyle/wm related)

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

M       source/blender/render/intern/source/pipeline.c

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

diff --git a/source/blender/render/intern/source/pipeline.c 
b/source/blender/render/intern/source/pipeline.c
index 676e28c..5631015 100644
--- a/source/blender/render/intern/source/pipeline.c
+++ b/source/blender/render/intern/source/pipeline.c
@@ -2013,10 +2013,11 @@ static void free_all_freestyle_renders(void)
                /* detach the window manager from freestyle bmain (see comments 
in
                 * add_freestyle() for more detail)
                 */
-               re1->freestyle_bmain->wm.first = re1->freestyle_bmain->wm.last 
= NULL;
+               if (re1->freestyle_bmain) {
+                       re1->freestyle_bmain->wm.first = 
re1->freestyle_bmain->wm.last = NULL;
 
-               BKE_main_free(re1->freestyle_bmain);
-               re1->freestyle_bmain = NULL;
+                       BKE_main_free(re1->freestyle_bmain);
+               }
        }
 }
 #endif

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