diff --git a/src/PIL/Image.py b/src/PIL/Image.py
index a770488b7..f980bb241 100644
--- a/src/PIL/Image.py
+++ b/src/PIL/Image.py
@@ -1561,7 +1561,7 @@ class Image:
         """
         return (
             self.mode in ("LA", "La", "PA", "RGBA", "RGBa")
-            or (self.mode == "P" and self.palette.mode.endswith("A"))
+            or (self.mode == "P" and self.palette and self.palette.mode.endswith("A"))
             or "transparency" in self.info
         )