diff --git a/ldm/generate.py b/ldm/generate.py
index e2d4a40de7..55cd5c5435 100644
--- a/ldm/generate.py
+++ b/ldm/generate.py
@@ -1033,7 +1033,9 @@ class Generate:
                 return True
         return False
 
-    def _check_for_erasure(self, image):
+    def _check_for_erasure(self, image:Image.Image)->bool:
+        if image.mode not in ('RGBA','RGB'):
+            return False
         width, height = image.size
         pixdata = image.load()
         colored = 0