diff --git a/routers/web/repo/issue.go b/routers/web/repo/issue.go
index 1d480096a9..616e08e4d8 100644
--- a/routers/web/repo/issue.go
+++ b/routers/web/repo/issue.go
@@ -1888,7 +1888,7 @@ func GetActionIssue(ctx *context.Context) *issues_model.Issue {
 		return nil
 	}
 	if err = issue.LoadAttributes(ctx); err != nil {
-		ctx.ServerError("LoadAttributes", nil)
+		ctx.ServerError("LoadAttributes", err)
 		return nil
 	}
 	return issue
@@ -3185,6 +3185,9 @@ func filterXRefComments(ctx *context.Context, issue *issues_model.Issue) error {
 // GetIssueAttachments returns attachments for the issue
 func GetIssueAttachments(ctx *context.Context) {
 	issue := GetActionIssue(ctx)
+	if ctx.Written() {
+		return
+	}
 	attachments := make([]*api.Attachment, len(issue.Attachments))
 	for i := 0; i < len(issue.Attachments); i++ {
 		attachments[i] = convert.ToAttachment(issue.Attachments[i])
diff --git a/routers/web/repo/issue_content_history.go b/routers/web/repo/issue_content_history.go
index 7e5295e757..49e0d6613d 100644
--- a/routers/web/repo/issue_content_history.go
+++ b/routers/web/repo/issue_content_history.go
@@ -24,7 +24,7 @@ import (
 // GetContentHistoryOverview get overview
 func GetContentHistoryOverview(ctx *context.Context) {
 	issue := GetActionIssue(ctx)
-	if issue == nil {
+	if ctx.Written() {
 		return
 	}
 
@@ -43,11 +43,11 @@ func GetContentHistoryOverview(ctx *context.Context) {
 // GetContentHistoryList  get list
 func GetContentHistoryList(ctx *context.Context) {
 	issue := GetActionIssue(ctx)
-	commentID := ctx.FormInt64("comment_id")
-	if issue == nil {
+	if ctx.Written() {
 		return
 	}
 
+	commentID := ctx.FormInt64("comment_id")
 	items, _ := issues_model.FetchIssueContentHistoryList(ctx, issue.ID, commentID)
 
 	// render history list to HTML for frontend dropdown items: (name, value)
@@ -113,7 +113,7 @@ func canSoftDeleteContentHistory(ctx *context.Context, issue *issues_model.Issue
 // GetContentHistoryDetail get detail
 func GetContentHistoryDetail(ctx *context.Context) {
 	issue := GetActionIssue(ctx)
-	if issue == nil {
+	if ctx.Written() {
 		return
 	}
 
@@ -179,7 +179,7 @@ func GetContentHistoryDetail(ctx *context.Context) {
 // SoftDeleteContentHistory soft delete
 func SoftDeleteContentHistory(ctx *context.Context) {
 	issue := GetActionIssue(ctx)
-	if issue == nil {
+	if ctx.Written() {
 		return
 	}
 
diff --git a/routers/web/repo/pull.go b/routers/web/repo/pull.go
index 830c8ad626..91869818dc 100644
--- a/routers/web/repo/pull.go
+++ b/routers/web/repo/pull.go
@@ -1455,10 +1455,10 @@ func DownloadPullDiffOrPatch(ctx *context.Context, patch bool) {
 // UpdatePullRequestTarget change pull request's target branch
 func UpdatePullRequestTarget(ctx *context.Context) {
 	issue := GetActionIssue(ctx)
-	pr := issue.PullRequest
 	if ctx.Written() {
 		return
 	}
+	pr := issue.PullRequest
 	if !issue.IsPull {
 		ctx.Error(http.StatusNotFound)
 		return
diff --git a/routers/web/repo/pull_review.go b/routers/web/repo/pull_review.go
index d43a786c56..7c13e76423 100644
--- a/routers/web/repo/pull_review.go
+++ b/routers/web/repo/pull_review.go
@@ -28,6 +28,9 @@ const (
 // RenderNewCodeCommentForm will render the form for creating a new review comment
 func RenderNewCodeCommentForm(ctx *context.Context) {
 	issue := GetActionIssue(ctx)
+	if ctx.Written() {
+		return
+	}
 	if !issue.IsPull {
 		return
 	}
@@ -52,10 +55,10 @@ func RenderNewCodeCommentForm(ctx *context.Context) {
 func CreateCodeComment(ctx *context.Context) {
 	form := web.GetForm(ctx).(*forms.CodeCommentForm)
 	issue := GetActionIssue(ctx)
-	if !issue.IsPull {
+	if ctx.Written() {
 		return
 	}
-	if ctx.Written() {
+	if !issue.IsPull {
 		return
 	}
 
@@ -185,10 +188,10 @@ func renderConversation(ctx *context.Context, comment *issues_model.Comment) {
 func SubmitReview(ctx *context.Context) {
 	form := web.GetForm(ctx).(*forms.SubmitReviewForm)
 	issue := GetActionIssue(ctx)
-	if !issue.IsPull {
+	if ctx.Written() {
 		return
 	}
-	if ctx.Written() {
+	if !issue.IsPull {
 		return
 	}
 	if ctx.HasError() {