diff --git a/src/croaker/transcoder.py b/src/croaker/transcoder.py
index 46eb7fb..e3a3902 100644
--- a/src/croaker/transcoder.py
+++ b/src/croaker/transcoder.py
@@ -35,7 +35,7 @@ class FrameAlignedStream:
     def frames(self):
         while True:
             frame = self._read_one_frame()
-            if frame is None:
+            if not frame:
                 return
             yield frame