diff --git a/src/modules/avp/avp.c b/src/modules/avp/avp.c
index f11d56baeb7..63ce537d7a9 100644
--- a/src/modules/avp/avp.c
+++ b/src/modules/avp/avp.c
@@ -1359,7 +1359,7 @@ static int attr_hdr_body2attrs(struct sip_msg* m, char* header_, char* prefix_)
 				}
 			};
 		}
-		if (s.len && s.s[0] == header->field_delimiter) {
+		if (s.len && s.s && s.s[0] == header->field_delimiter) {
 			s.s++;
 			s.len--;
 		}