diff --git a/web/app/components/workflow/nodes/_base/components/variable/use-match-schema-type.ts b/web/app/components/workflow/nodes/_base/components/variable/use-match-schema-type.ts
index fdde6685de..2c0c91b7f5 100644
--- a/web/app/components/workflow/nodes/_base/components/variable/use-match-schema-type.ts
+++ b/web/app/components/workflow/nodes/_base/components/variable/use-match-schema-type.ts
@@ -4,7 +4,7 @@ import type { AnyObj } from './match-schema-type'
 import matchTheSchemaType from './match-schema-type'
 
 export const getMatchedSchemaType = (obj: AnyObj, schemaTypeDefinitions?: SchemaTypeDefinition[]): string => {
-  if(!schemaTypeDefinitions) return ''
+  if(!schemaTypeDefinitions || obj === undefined || obj === null) return ''
   const matched = schemaTypeDefinitions.find(def => matchTheSchemaType(obj, def.schema))
   return matched ? matched.name : ''
 }