diff --git a/src/aliyunoss.cpp b/src/aliyunoss.cpp
index 2d404dc..d587b30 100644
--- a/src/aliyunoss.cpp
+++ b/src/aliyunoss.cpp
@@ -78,7 +78,16 @@ std::string module::aliyun_oss::updata(
 
     }
     else {
-        return_msg = "put object from buffer failed,code:" + std::to_string(s->code) + ",error_code:" + s->error_code + ",error_msg:" + s->error_msg;
+        return_msg = "exec failed";
+        if(s->code != NULL){
+            return_msg += ",code:"+ std::to_string(s->code);
+        }
+        if(s->error_code != NULL){
+            return_msg += ",error_code:"+ std::to_string(s->error_code);
+        }
+        if(s->error_msg != NULL){
+            return_msg += ",error_msg:"+ std::to_string(s->error_code);
+        }
     }
 
 
@@ -127,7 +136,16 @@ std::string module::aliyun_oss::upfile(const std::string& endpoint, const std::s
 
     }
     else {
-        return_msg = "put object from file failed,code:" + std::to_string(s->code) + ",error_code:" + s->error_code + ",error_msg:" + s->error_msg;
+        return_msg = "exec failed";
+        if(s->code != NULL){
+            return_msg += ",code:"+ std::to_string(s->code);
+        }
+        if(s->error_code != NULL){
+            return_msg += ",error_code:"+ std::to_string(s->error_code);
+        }
+        if(s->error_msg != NULL){
+            return_msg += ",error_msg:"+ std::to_string(s->error_code);
+        }
     }
 
     aos_pool_destroy(p);
@@ -169,7 +187,16 @@ std::string module::aliyun_oss::del(const std::string& endpoint, const std::stri
 
     }
     else {
-        return_msg = "delete object failed,code:" + std::to_string(s->code) + ",error_code:" + s->error_code + ",error_msg:" + s->error_msg;
+        return_msg = "exec failed";
+        if(s->code != NULL){
+            return_msg += ",code:"+ std::to_string(s->code);
+        }
+        if(s->error_code != NULL){
+            return_msg += ",error_code:"+ std::to_string(s->error_code);
+        }
+        if(s->error_msg != NULL){
+            return_msg += ",error_msg:"+ std::to_string(s->error_code);
+        }
     }
 
     aos_pool_destroy(p);