diff --git a/sys/netgraph7/ppp/ng_ppp.c b/sys/netgraph7/ppp/ng_ppp.c
--- a/sys/netgraph7/ppp/ng_ppp.c
+++ b/sys/netgraph7/ppp/ng_ppp.c
@@ -2289,6 +2289,7 @@
 
 	/* Sort active links by latency */
 	compareLatencies = latency;
+	KKASSERT(compareLatencies != NULL);
 	kqsort(sortByLatency,
 	    priv->numActiveLinks, sizeof(*sortByLatency), ng_ppp_intcmp);
 	compareLatencies = NULL;