Index: lldpd.c
===================================================================
RCS file: /cvs/src/usr.sbin/lldpd/lldpd.c,v
diff -u -p -r1.2 lldpd.c
--- lldpd.c	2 May 2025 09:56:01 -0000	1.2
+++ lldpd.c	2 May 2025 10:23:45 -0000
@@ -943,6 +943,12 @@ ctl_recv(int fd, short events, void *arg
 		return;
 	}
 
+	if (ctl->ctl_handler == NULL) {
+		lwarn("%s: message %u did not set ctl_handler", __func__,
+		    msgtype);
+		abort();
+	}
+
 	(*ctl->ctl_handler)(lldpd, ctl, fd);
 }