diff --git a/routers/private/hook_post_receive.go b/routers/private/hook_post_receive.go
index a9aae80cd5..7bcbe599ce 100644
--- a/routers/private/hook_post_receive.go
+++ b/routers/private/hook_post_receive.go
@@ -164,49 +164,10 @@ func HookPostReceive(ctx *gitea_context.PrivateContext) {
 
 	var pusher *user_model.User
 
-	// handle pull request merging, a pull request action should only push 1 commit
-	if opts.PullRequestAction == repo_module.PullRequestActionMerge && len(updates) >= 1 {
-		// Get the pull request
-		pr, err := issues_model.GetPullRequestByID(ctx, opts.PullRequestID)
-		if err != nil {
-			log.Error("GetPullRequestByID[%d]: %v", opts.PullRequestID, err)
-			ctx.JSON(http.StatusInternalServerError, private.HookPostReceiveResult{
-				Err: fmt.Sprintf("GetPullRequestByID[%d]: %v", opts.PullRequestID, err),
-			})
-			return
-		}
-
-		pusher, err = user_model.GetUserByID(ctx, opts.UserID)
-		if err != nil {
-			log.Error("Failed to Update: %s/%s Error: %v", ownerName, repoName, err)
-			ctx.JSON(http.StatusInternalServerError, private.HookPostReceiveResult{
-				Err: fmt.Sprintf("Failed to Update: %s/%s Error: %v", ownerName, repoName, err),
-			})
-			return
-		}
-
-		pr.MergedCommitID = updates[len(updates)-1].NewCommitID
-		pr.MergedUnix = timeutil.TimeStampNow()
-		pr.Merger = pusher
-		pr.MergerID = opts.UserID
-
-		if err := db.WithTx(ctx, func(ctx context.Context) error {
-			// Removing an auto merge pull and ignore if not exist
-			if err := pull_model.DeleteScheduledAutoMerge(ctx, pr.ID); err != nil && !db.IsErrNotExist(err) {
-				return fmt.Errorf("DeleteScheduledAutoMerge[%d]: %v", opts.PullRequestID, err)
-			}
-
-			if _, err := pr.SetMerged(ctx); err != nil {
-				return fmt.Errorf("Failed to SetMerged: %s/%s Error: %v", ownerName, repoName, err)
-			}
-			return nil
-		}); err != nil {
-			log.Error("%v", err)
-			ctx.JSON(http.StatusInternalServerError, private.HookPostReceiveResult{
-				Err: err.Error(),
-			})
-			return
-		}
+	// handle pull request merging, a pull request action should push at least 1 commit
+	handlePullRequestMerging(ctx, opts, pusher, ownerName, repoName, updates)
+	if ctx.Written() {
+		return
 	}
 
 	isPrivate := opts.GitPushOptions.Bool(private.GitPushOptionRepoPrivate)
@@ -362,3 +323,52 @@ func HookPostReceive(ctx *gitea_context.PrivateContext) {
 		RepoWasEmpty: wasEmpty,
 	})
 }
+
+func handlePullRequestMerging(ctx *gitea_context.PrivateContext, opts *private.HookOptions, pusher *user_model.User, ownerName, repoName string, updates []*repo_module.PushUpdateOptions) {
+	// handle pull request merging, a pull request action should only push 1 commit
+	if opts.PullRequestAction == repo_module.PullRequestActionMerge && len(updates) >= 1 {
+		// Get the pull request
+		pr, err := issues_model.GetPullRequestByID(ctx, opts.PullRequestID)
+		if err != nil {
+			log.Error("GetPullRequestByID[%d]: %v", opts.PullRequestID, err)
+			ctx.JSON(http.StatusInternalServerError, private.HookPostReceiveResult{
+				Err: fmt.Sprintf("GetPullRequestByID[%d]: %v", opts.PullRequestID, err),
+			})
+			return
+		}
+
+		if pusher == nil {
+			pusher, err = user_model.GetUserByID(ctx, opts.UserID)
+			if err != nil {
+				log.Error("Failed to Update: %s/%s Error: %v", ownerName, repoName, err)
+				ctx.JSON(http.StatusInternalServerError, private.HookPostReceiveResult{
+					Err: fmt.Sprintf("Failed to Update: %s/%s Error: %v", ownerName, repoName, err),
+				})
+				return
+			}
+		}
+
+		pr.MergedCommitID = updates[len(updates)-1].NewCommitID
+		pr.MergedUnix = timeutil.TimeStampNow()
+		pr.Merger = pusher
+		pr.MergerID = opts.UserID
+
+		if err := db.WithTx(ctx, func(ctx context.Context) error {
+			// Removing an auto merge pull and ignore if not exist
+			if err := pull_model.DeleteScheduledAutoMerge(ctx, pr.ID); err != nil && !db.IsErrNotExist(err) {
+				return fmt.Errorf("DeleteScheduledAutoMerge[%d]: %v", opts.PullRequestID, err)
+			}
+
+			if _, err := pr.SetMerged(ctx); err != nil {
+				return fmt.Errorf("Failed to SetMerged: %s/%s Error: %v", ownerName, repoName, err)
+			}
+			return nil
+		}); err != nil {
+			log.Error("%v", err)
+			ctx.JSON(http.StatusInternalServerError, private.HookPostReceiveResult{
+				Err: err.Error(),
+			})
+			return
+		}
+	}
+}