diff -r ce342364fad5 -r c284c15509a8 ui/cocoa/window.m
--- a/ui/cocoa/window.m	Wed Jul 13 16:40:59 2016 +0200
+++ b/ui/cocoa/window.m	Sat Sep 17 19:32:44 2016 +0200
@@ -186,6 +186,7 @@
     
     obj->widget = (NSView*)window;
     obj->window = window_data;
+    obj->document = NULL;
     obj->container = ui_window_container(obj, window);