:bug: Fix npe https://ld246.com/article/1715715031420

kernel/model/attribute_view.go

@@ -3174,7 +3174,7 @@ func replaceRelationAvValues(avID, previousID, nextID string) {
 				continue
 			}
 
-			if avID != srcKeyValues.Key.Relation.AvID {
+			if nil == srcKeyValues.Key.Relation || avID != srcKeyValues.Key.Relation.AvID {
 				continue
 			}