diff --git a/models/review.go b/models/review.go
index c02f7a5ba9..5a4e0be244 100644
--- a/models/review.go
+++ b/models/review.go
@@ -177,6 +177,9 @@ func CreateReview(opts CreateReviewOptions) (*Review, error) {
 }
 
 func getCurrentReview(e Engine, reviewer *User, issue *Issue) (*Review, error) {
+	if reviewer == nil {
+		return nil, nil
+	}
 	reviews, err := findReviews(e, FindReviewOptions{
 		Type:       ReviewTypePending,
 		IssueID:    issue.ID,