diff --git a/src/sipsess/sess.c b/src/sipsess/sess.c
index 511a6e062..85ed42fc4 100644
--- a/src/sipsess/sess.c
+++ b/src/sipsess/sess.c
@@ -356,5 +356,5 @@ bool sipsess_refresh_allowed(const struct sipsess *sess)
 
 bool sipsess_ack_pending(const struct sipsess *sess)
 {
-	return sess->replyl.head ? true : false;
+	return sess && sess->replyl.head ? true : false;
 }