diff --git a/source/libs/function/src/builtins.c b/source/libs/function/src/builtins.c
index 9563a81b7b..64e71cb503 100644
--- a/source/libs/function/src/builtins.c
+++ b/source/libs/function/src/builtins.c
@@ -700,6 +700,11 @@ static int32_t translateDiff(SFunctionNode* pFunc, char* pErrBuf, int32_t len) {
 
   //param1
   if (numOfParams == 2) {
+    uint8_t paraType = ((SExprNode*)nodesListGetNode(pFunc->pParameterList, 1))->resType.type;
+    if (!IS_INTEGER_TYPE(paraType)) {
+      return invaildFuncParaTypeErrMsg(pErrBuf, len, pFunc->functionName);
+    }
+
     SNode* pParamNode1 = nodesListGetNode(pFunc->pParameterList, 1);
     if (QUERY_NODE_VALUE != nodeType(pParamNode1)) {
       return invaildFuncParaTypeErrMsg(pErrBuf, len, pFunc->functionName);