Commit: 0095f4f83465bc9fdc13b79d2126f5623e291d7c
Author: Julian Eisel
Date:   Tue Jun 13 23:37:37 2017 +0200
Branches: blender2.8
https://developer.blender.org/rB0095f4f83465bc9fdc13b79d2126f5623e291d7c

Fix T51794: Crash on hair file when opening with no UI

Just a workaround for now.

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

M       source/blender/blenkernel/intern/blendfile.c

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

diff --git a/source/blender/blenkernel/intern/blendfile.c 
b/source/blender/blenkernel/intern/blendfile.c
index 9e244246e16..111dc98476f 100644
--- a/source/blender/blenkernel/intern/blendfile.c
+++ b/source/blender/blenkernel/intern/blendfile.c
@@ -332,7 +332,17 @@ static void setup_app_data(
                        }
                }
        }
-       BKE_scene_set_background(G.main, curscene);
+
+       if (mode == LOAD_UI_OFF && BLI_listbase_is_empty(&G.main->wm)) {
+               /* XXX prevent crash in pdInitEffectors called through 
DEG_scene_relations_rebuild (see T51794).
+                * Can be removed once BKE_scene_layer_context_active_ex gets 
workspace passed. */
+               BLI_addhead(&G.main->wm, CTX_wm_manager(C));
+               BKE_scene_set_background(G.main, curscene);
+               BLI_listbase_clear(&G.main->wm);
+       }
+       else {
+               BKE_scene_set_background(G.main, curscene);
+       }
 
        if (mode != LOAD_UNDO) {
                RE_FreeAllPersistentData();

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