Index: src_plugins/dialogs/dlg_plugins.c
===================================================================
--- src_plugins/dialogs/dlg_plugins.c	(revision 33059)
+++ src_plugins/dialogs/dlg_plugins.c	(revision 33060)
@@ -94,6 +94,11 @@
 		return;
 	}
 
+	if (p->references > 1) {
+		rnd_message(RND_MSG_ERROR, "Can not unload '%s' while other active plugins still depend on it\n", p->name);
+		return;
+	}
+
 	pup_unload(&rnd_pup, p, NULL);
 
 	/* rebuild the whole tree since we may have unloaded more than one plugins */