--- a/libfreeDiameter/dictionary.c	Tue Dec 08 13:52:32 2009 +0900
+++ b/libfreeDiameter/dictionary.c	Tue Dec 08 14:03:44 2009 +0900
@@ -1383,6 +1383,14 @@
 		CHECK_PARAMS( ((struct dict_cmd_data *)data)->cmd_flag_mask & CMD_FLAG_REQUEST   );
 	}
 	
+	/* We have to check that the new values are not equal to the sentinels */
+	if (type == DICT_VENDOR) {
+		CHECK_PARAMS( ((struct dict_vendor_data *)data)->vendor_id != 0   );
+	}
+	if (type == DICT_APPLICATION) {
+		CHECK_PARAMS( ((struct dict_application_data *)data)->application_id != 0   );
+	}
+	
 	/* Parameters are valid, create the new object */
 	CHECK_MALLOC(  new = malloc(sizeof(struct dict_object))  );