diff --git a/src/upf/context.c b/src/upf/context.c
index d7c5219cb..9350f5419 100644
--- a/src/upf/context.c
+++ b/src/upf/context.c
@@ -178,7 +178,10 @@ upf_sess_t *upf_sess_add(ogs_pfcp_f_seid_t *cp_f_seid)
     ogs_assert(cp_f_seid);
 
     ogs_pool_id_calloc(&upf_sess_pool, &sess);
-    ogs_assert(sess);
+    if (!sess) {
+        ogs_error("Maximum number of Session reached");
+        return NULL;
+    }
 
     ogs_pfcp_pool_init(&sess->pfcp);