Index: src/conf_hid.c
===================================================================
--- src/conf_hid.c	(revision 20974)
+++ src/conf_hid.c	(revision 20975)
@@ -44,6 +44,14 @@
 
 void conf_pcb_hid_uninit(void)
 {
+#ifndef NDEBUG
+	{
+		htpp_entry_t *e;
+		for(e = htpp_first(conf_hid_ids); e != NULL; e = htpp_next(conf_hid_ids, e))
+			fprintf(stderr, "ERROR: conf_hid id left registered: '%s'\n", e->key);
+	}
+#endif
+
 	if (conf_hid_ids != NULL) {
 		htpp_free(conf_hid_ids);
 		conf_hid_ids = NULL;