diff --git a/source/blender/render/intern/source/pipeline.c b/source/blender/render/intern/source/pipeline.c
index ba8265a..0f1ccd0 100644
--- a/source/blender/render/intern/source/pipeline.c
+++ b/source/blender/render/intern/source/pipeline.c
@@ -1037,6 +1037,10 @@ static void threaded_tile_processor(Render *re)
 				thread[a].display_update = re->display_update;
 				thread[a].duh = re->duh;
 			}
+            else
+              {
+                thread[a].display_update = NULL;
+              } /*if*/
 			BLI_insert_thread(&threads, &thread[a]);
 		}