diff --git a/source/libs/scalar/src/scalar.c b/source/libs/scalar/src/scalar.c
index 4c969f2db2..d1271e9290 100644
--- a/source/libs/scalar/src/scalar.c
+++ b/source/libs/scalar/src/scalar.c
@@ -1359,6 +1359,7 @@ EDealRes sclWalkOperator(SNode *pNode, SScalarCtx *ctx) {
 
   ctx->code = sclExecOperator(node, ctx, &output);
   if (ctx->code) {
+    sclFreeParam(&output);
     return DEAL_RES_ERROR;
   }