diff -r 8a4451fcb736 -r b907d8059290 ui/common/types.c
--- a/ui/common/types.c	Fri Nov 09 15:43:46 2018 +0100
+++ b/ui/common/types.c	Fri Nov 09 17:11:12 2018 +0100
@@ -373,6 +373,7 @@
     t->length = NULL;
     t->remove = NULL;
     t->obj = NULL;
+    t->undomgr = NULL;
 }
 
 void uic_range_unbind(UiRange *r) {