diff -r b25f54b51d76 -r d6baaa93f7be ui/gtk/toolbar.c
--- a/ui/gtk/toolbar.c	Sun Jul 13 11:02:45 2025 +0200
+++ b/ui/gtk/toolbar.c	Sun Jul 13 11:38:27 2025 +0200
@@ -155,6 +155,7 @@
         event->callback = item->args.onclick;
         event->userdata = item->args.onclickdata;
         event->customdata = NULL;
+        event->customint = 0;
         event->value = 0;
         
         g_signal_connect(
@@ -237,6 +238,7 @@
     e.window = event->obj->window;
     e.document = event->obj->ctx->document;
     e.eventdata = NULL;
+    e.eventdatatype = 0;
     e.intval = gtk_toggle_tool_button_get_active(widget);
     
     if(event->callback) {