fix for rare crash we have with some mango files.

1 files changed, 10 insertions, 6 deletions

diff --git a/source/blender/render/intern/source/external_engine.c b/source/blender/render/intern/source/external_engine.c
index 5bb3e4605a2..e3eab0c3b34 100644
--- a/source/blender/render/intern/source/external_engine.c
+++ b/source/blender/render/intern/source/external_engine.c
@@ -173,12 +173,16 @@ RenderResult *RE_engine_begin_result(RenderEngine *engine, int x, int y, int w,
 	disprect.ymax = y + h;
 
 	result = render_result_new(re, &disprect, 0, RR_USE_MEM);
-	BLI_addtail(&engine->fullresult, result);
-	
-	result->tilerect.xmin += re->disprect.xmin;
-	result->tilerect.xmax += re->disprect.xmin;
-	result->tilerect.ymin += re->disprect.ymin;
-	result->tilerect.ymax += re->disprect.ymin;
+
+	/* can be NULL if we CLAMP the width or height to 0 */
+	if (result) {
+		BLI_addtail(&engine->fullresult, result);
+
+		result->tilerect.xmin += re->disprect.xmin;
+		result->tilerect.xmax += re->disprect.xmin;
+		result->tilerect.ymin += re->disprect.ymin;
+		result->tilerect.ymax += re->disprect.ymin;
+	}
 
 	return result;
 }