diff --git a/services/pull/pull.go b/services/pull/pull.go
index 909201bc7f..f80f290333 100644
--- a/services/pull/pull.go
+++ b/services/pull/pull.go
@@ -188,7 +188,7 @@ func NewPullRequest(ctx context.Context, opts *NewPullRequestOptions) error {
 		}
 
 		for _, reviewer := range opts.Reviewers {
-			err = IsValidReviewRequest(ctx, reviewer, issue.Poster, true, issue, &permDoer)
+			err = isValidReviewRequest(ctx, reviewer, issue.Poster, true, issue, &permDoer)
 			if err != nil {
 				return err
 			}
@@ -197,15 +197,17 @@ func NewPullRequest(ctx context.Context, opts *NewPullRequestOptions) error {
 			if err != nil {
 				return err
 			}
-			reviewNotifiers = append(reviewNotifiers, &ReviewRequestNotifier{
-				Comment:  comment,
-				IsAdd:    true,
-				Reviewer: reviewer,
-			})
+			if comment != nil {
+				reviewNotifiers = append(reviewNotifiers, &ReviewRequestNotifier{
+					Comment:  comment,
+					IsAdd:    true,
+					Reviewer: reviewer,
+				})
+			}
 		}
 
 		for _, teamReviewer := range opts.TeamReviewers {
-			err = IsValidTeamReviewRequest(ctx, teamReviewer, issue.Poster, true, issue)
+			err = isValidTeamReviewRequest(ctx, teamReviewer, issue.Poster, true, issue)
 			if err != nil {
 				return err
 			}
@@ -214,11 +216,13 @@ func NewPullRequest(ctx context.Context, opts *NewPullRequestOptions) error {
 			if err != nil {
 				return err
 			}
-			reviewNotifiers = append(reviewNotifiers, &ReviewRequestNotifier{
-				Comment:    comment,
-				IsAdd:      true,
-				ReviewTeam: teamReviewer,
-			})
+			if comment != nil {
+				reviewNotifiers = append(reviewNotifiers, &ReviewRequestNotifier{
+					Comment:    comment,
+					IsAdd:      true,
+					ReviewTeam: teamReviewer,
+				})
+			}
 		}
 
 		return nil
diff --git a/services/pull/review_request.go b/services/pull/review_request.go
index 50c8dd5be2..5ba9711b9a 100644
--- a/services/pull/review_request.go
+++ b/services/pull/review_request.go
@@ -19,7 +19,7 @@ import (
 
 // ReviewRequest add or remove a review request from a user for this PR, and make comment for it.
 func ReviewRequest(ctx context.Context, issue *issues_model.Issue, doer *user_model.User, permDoer *access_model.Permission, reviewer *user_model.User, isAdd bool) (comment *issues_model.Comment, err error) {
-	err = IsValidReviewRequest(ctx, reviewer, doer, isAdd, issue, permDoer)
+	err = isValidReviewRequest(ctx, reviewer, doer, isAdd, issue, permDoer)
 	if err != nil {
 		return nil, err
 	}
@@ -41,8 +41,8 @@ func ReviewRequest(ctx context.Context, issue *issues_model.Issue, doer *user_mo
 	return comment, err
 }
 
-// IsValidReviewRequest Check permission for ReviewRequest
-func IsValidReviewRequest(ctx context.Context, reviewer, doer *user_model.User, isAdd bool, issue *issues_model.Issue, permDoer *access_model.Permission) error {
+// isValidReviewRequest Check permission for ReviewRequest
+func isValidReviewRequest(ctx context.Context, reviewer, doer *user_model.User, isAdd bool, issue *issues_model.Issue, permDoer *access_model.Permission) error {
 	if reviewer.IsOrganization() {
 		return issues_model.ErrNotValidReviewRequest{
 			Reason: "Organization can't be added as reviewer",
@@ -125,8 +125,8 @@ func IsValidReviewRequest(ctx context.Context, reviewer, doer *user_model.User,
 	}
 }
 
-// IsValidTeamReviewRequest Check permission for ReviewRequest Team
-func IsValidTeamReviewRequest(ctx context.Context, reviewer *org_model.Team, doer *user_model.User, isAdd bool, issue *issues_model.Issue) error {
+// isValidTeamReviewRequest Check permission for ReviewRequest Team
+func isValidTeamReviewRequest(ctx context.Context, reviewer *org_model.Team, doer *user_model.User, isAdd bool, issue *issues_model.Issue) error {
 	if doer.IsOrganization() {
 		return issues_model.ErrNotValidReviewRequest{
 			Reason: "Organization can't be doer to add reviewer",
@@ -174,7 +174,7 @@ func IsValidTeamReviewRequest(ctx context.Context, reviewer *org_model.Team, doe
 
 // TeamReviewRequest add or remove a review request from a team for this PR, and make comment for it.
 func TeamReviewRequest(ctx context.Context, issue *issues_model.Issue, doer *user_model.User, reviewer *org_model.Team, isAdd bool) (comment *issues_model.Comment, err error) {
-	err = IsValidTeamReviewRequest(ctx, reviewer, doer, isAdd, issue)
+	err = isValidTeamReviewRequest(ctx, reviewer, doer, isAdd, issue)
 	if err != nil {
 		return nil, err
 	}