diff -r b25f54b51d76 -r d6baaa93f7be ui/gtk/image.c
--- a/ui/gtk/image.c	Sun Jul 13 11:02:45 2025 +0200
+++ b/ui/gtk/image.c	Sun Jul 13 11:38:27 2025 +0200
@@ -438,6 +438,7 @@
     event.window = event.obj->window;
     event.document = event.obj->ctx->document;
     event.eventdata = NULL;
+    event.eventdatatype = 0;
     event.intval = gtk_gesture_single_get_current_button(GTK_GESTURE_SINGLE(gesture));
     event.set = 0;
     callback(&event, userdata);