diff --git a/photo_review/photo_review.py b/photo_review/photo_review.py
index 09a415d..a42bbe0 100644
--- a/photo_review/photo_review.py
+++ b/photo_review/photo_review.py
@@ -107,7 +107,7 @@ def get_image_rotation_angle(img):
 # 旋转图片
 def rotate_image(img, angle):
     if angle == 0:
-        return
+        return img
     height, width, _ = img.shape
     if angle == 180:
         new_width = width