diff --git a/morituri/image/image.py b/morituri/image/image.py
index 0c29006..786be72 100644
--- a/morituri/image/image.py
+++ b/morituri/image/image.py
@@ -249,7 +249,7 @@ class ImageEncodeTask(task.MultiSeparateTask):
             htoa = cue.table.tracks[0].indexes[0]
             self.debug('encoding htoa track')
             add(htoa)
-        except IndexError:
+        except (KeyError, IndexError):
             self.debug('no htoa track')
             pass