diff --git a/module/mr/model.php b/module/mr/model.php
index 5435a291be..bc845d1733 100644
--- a/module/mr/model.php
+++ b/module/mr/model.php
@@ -923,9 +923,9 @@ class mrModel extends model
      * @param  string $projectID
      * @param  int    $MRID
      * @access public
-     * @return array
+     * @return array|null
      */
-    public function apiGetDiffVersions(int $hostID, string $projectID, int $MRID): array
+    public function apiGetDiffVersions(int $hostID, string $projectID, int $MRID): array|null
     {
         $url = sprintf($this->loadModel('gitlab')->getApiRoot($hostID), "/projects/$projectID/merge_requests/$MRID/versions");
         return json_decode(commonModel::http($url));
@@ -940,9 +940,9 @@ class mrModel extends model
      * @param  int    $MRID
      * @param  int    $versionID
      * @access public
-     * @return object
+     * @return object|null
      */
-    public function apiGetSingleDiffVersion(int $hostID, string $projectID, int $MRID, int $versionID): object
+    public function apiGetSingleDiffVersion(int $hostID, string $projectID, int $MRID, int $versionID): object|null
     {
         $url = sprintf($this->loadModel('gitlab')->getApiRoot($hostID), "/projects/$projectID/merge_requests/$MRID/versions/$versionID");
         return json_decode(commonModel::http($url));
diff --git a/module/mr/test/model/apigetdiffversions.php b/module/mr/test/model/apigetdiffversions.php
new file mode 100755
index 0000000000..8f9905fd02
--- /dev/null
+++ b/module/mr/test/model/apigetdiffversions.php
@@ -0,0 +1,35 @@
+#!/usr/bin/env php
+<?php
+
+/**
+
+title=测试 mrModel::apiGetDiffVersions();
+timeout=0
+cid=0
+
+- 不存在的主机 @0
+- 正确的数据
+ - 第0条的id属性 @43
+ - 第0条的head_commit_sha属性 @cedfe9a54614e71085e93a5a2e819617b48d43c5
+
+*/
+
+include dirname(__FILE__, 5) . '/test/lib/init.php';
+
+zdTable('pipeline')->gen(1);
+
+global $tester;
+$mrModel = $tester->loadModel('mr');
+
+$hostID = array
+(
+    'gitlab' => 1,
+    'error'  => 10
+);
+
+$projectID = 3;
+$mrID      = 36;
+
+r($mrModel->apiGetDiffVersions($hostID['error'], $projectID, $mrID)) && p() && e('0'); // 不存在的主机
+
+r($mrModel->apiGetDiffVersions($hostID['gitlab'], $projectID, $mrID)) && p('0:id,head_commit_sha') && e('43,cedfe9a54614e71085e93a5a2e819617b48d43c5'); // 正确的数据
\ No newline at end of file