diff -r a0ea718ab1d8 -r 24d9a92fd048 ui/gtk/toolkit.c
--- a/ui/gtk/toolkit.c	Fri Feb 16 18:33:34 2024 +0100
+++ b/ui/gtk/toolkit.c	Fri Feb 16 19:00:53 2024 +0100
@@ -247,7 +247,9 @@
 }
 
 void ui_destroy_vardata(GtkWidget *object, UiVarEventData *data) {
-    ui_destroy_boundvar(data->obj->ctx, data->var);
+    if(data->var) {
+        ui_destroy_boundvar(data->obj->ctx, data->var);
+    }
     free(data);
 }