diff --git a/konabot/plugins/roll_dice/roll_dice.py b/konabot/plugins/roll_dice/roll_dice.py
index 96fe54b..1ba529e 100644
--- a/konabot/plugins/roll_dice/roll_dice.py
+++ b/konabot/plugins/roll_dice/roll_dice.py
@@ -332,9 +332,10 @@ async def generate_dice_image(number: str) -> BytesIO:
     up_direction = (51 - 16, 5 - 30)  # 右上角点 - 左上角点
 
     move_distance = (up_direction[0] * (stretch_k - 1), up_direction[1] * (stretch_k - 1))
-    
+
     # 加载背景图像，保留透明通道
-    background = cv2.imread(ASSETS_PATH / "img" / "dice" / "template.png", cv2.IMREAD_UNCHANGED)
+    background = cv2.imread(str(ASSETS_PATH / "img" / "dice" / "template.png"), cv2.IMREAD_UNCHANGED)
+    assert background is not None
 
     height, width = background.shape[:2]
 
@@ -352,7 +353,7 @@ async def generate_dice_image(number: str) -> BytesIO:
     ], dtype=np.float32)
     corners[:, 0] += offset_x
     corners[:, 1] += offset_y
-
+    
 
     # 对文本图像进行3D变换（保持透明通道）
     transformed_text, transform_matrix = perspective_transform(text_image, background, corners)