diff -r 5099a34747c4 -r a8faf8757450 ui/gtk/button.c
--- a/ui/gtk/button.c	Sun Apr 07 11:26:38 2024 +0200
+++ b/ui/gtk/button.c	Sun Apr 07 12:36:07 2024 +0200
@@ -69,6 +69,7 @@
         event->userdata = args.onclickdata;
         event->callback = args.onclick;
         event->value = 0;
+        event->customdata = NULL;
 
         g_signal_connect(
                 button,