diff --git a/src/main/java/com/baomidou/mybatisplus/core/metadata/MPJTableFieldInfo.java b/src/main/java/com/baomidou/mybatisplus/core/metadata/MPJTableFieldInfo.java
index 8d87637..bf92e45 100644
--- a/src/main/java/com/baomidou/mybatisplus/core/metadata/MPJTableFieldInfo.java
+++ b/src/main/java/com/baomidou/mybatisplus/core/metadata/MPJTableFieldInfo.java
@@ -166,7 +166,7 @@ public class MPJTableFieldInfo {
                 .filter(i -> i.getColumn().equals(bindName))
                 .map(TableFieldInfo::getField).findFirst().orElse(null);
         if (field == null && bindName.equals(info.getKeyColumn())) {
-            this.bindField = ReflectionKit.getFieldList(joinClass).stream().filter(f ->
+            field = ReflectionKit.getFieldList(joinClass).stream().filter(f ->
                     f.getName().equals(info.getKeyProperty())).findFirst().orElse(null);
         }
         if (field == null) {