diff --git a/modules/masking.py b/modules/masking.py
index ca8db1040..76bd93137 100644
--- a/modules/masking.py
+++ b/modules/masking.py
@@ -340,7 +340,7 @@ def get_mask(input_image: gr.Image, input_mask: gr.Image):
             largest_size = cv2.contourArea(contours[0]) if len(contours) > 0 else 0
             for i, contour in enumerate(contours):
                 area_size = cv2.contourArea(contour)
-                luminance = int(255.0 * area_size / largest_size)
+                luminance = int(255.0 * area_size / largest_size) if largest_size > 0 else 0
                 if luminance < 1:
                     break
                 cv2.drawContours(output_mask, contours, i, (luminance), -1)