diff --git a/kernel/model/transaction.go b/kernel/model/transaction.go
index 87cc11bf8..ef2d460a4 100644
--- a/kernel/model/transaction.go
+++ b/kernel/model/transaction.go
@@ -1219,6 +1219,10 @@ func refreshDynamicRefTexts(updatedDefNodes map[string]*ast.Node, updatedTrees m
 
 			changedAv := false
 			blockValues := attrView.GetBlockKeyValues()
+			if nil == blockValues {
+				continue
+			}
+
 			for _, blockValue := range blockValues.Values {
 				if blockValue.Block.ID == updatedDefNode.ID {
 					newContent := getNodeRefText(updatedDefNode)