diff -r bf810176ddb8 -r e5f4d8af567e ui/gtk/graphics.c
--- a/ui/gtk/graphics.c	Mon Feb 12 21:13:23 2024 +0100
+++ b/ui/gtk/graphics.c	Sun Jun 09 15:43:08 2024 +0200
@@ -104,6 +104,8 @@
         event->obj = obj;
         event->callback = f;
         event->userdata = u;
+        event->customdata = NULL;
+        event->value = 0;
         
         g_signal_connect(G_OBJECT(widget),
                 "button-press-event",