diff --git a/contactsCJ/include/contacts_utils.h b/contactsCJ/include/contacts_utils.h
index d311014b3a574bb3a7bd6c4c0ad4646ae5e8b080..aebb5ff962014bf78612cbc29e11092861e02e5a 100644
--- a/contactsCJ/include/contacts_utils.h
+++ b/contactsCJ/include/contacts_utils.h
@@ -137,7 +137,7 @@ struct KeyWithValueType {
     int64_t integer = 0;
     double dou = 0.0;
     std::string string;
-    uint8_t tag;
+    uint8_t tag = static_cast<int>(DataShare::DataType::TYPE_NULL);
 
     KeyWithValueType(std::string k, int64_t v)
     {
@@ -166,6 +166,7 @@ struct KeyWithValueType {
         if (*errCode != SUCCESS) {
             return *errCode;
         }
+        dst[dstIdx].value[idx].tag = this->tag;
         if (this->tag == static_cast<int>(DataShare::DataType::TYPE_INTEGER)) {
             dst[dstIdx].value[idx].integer = this->integer;
         } else if (this->tag == static_cast<int>(DataShare::DataType::TYPE_FLOAT)) {
diff --git a/contactsCJ/src/contacts_utils.cpp b/contactsCJ/src/contacts_utils.cpp
index cd3653f8c3a0ab08802249f9137d0d5cdb9eeb53..ef86940f86c2b474e79fc6d8caabbe76920a249b 100644
--- a/contactsCJ/src/contacts_utils.cpp
+++ b/contactsCJ/src/contacts_utils.cpp
@@ -42,6 +42,9 @@ bool allocBucket(ValuesBucket* b, size_t total, int32_t *errCode)
             *errCode = ERROR;
             b->freeContent();
             return false;
+        } else {
+            b->value->tag = static_cast<int>(DataType::TYPE_NULL);
+            b->value->string = nullptr;
         }
     }
     return true;