diff --git a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLInListExpr.java b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLInListExpr.java
index c33e653b79..f00f786139 100644
--- a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLInListExpr.java
+++ b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLInListExpr.java
@@ -58,6 +58,10 @@ public class SQLInListExpr extends SQLExprImpl implements Serializable {
     }
 
     public void setExpr(SQLExpr expr) {
+        if (expr != null) {
+            expr.setParent(this);
+        }
+        
         this.expr = expr;
     }