diff options
| -rw-r--r-- | ranger/container/history.py | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/ranger/container/history.py b/ranger/container/history.py index 8300edae..c1d929ed 100644 --- a/ranger/container/history.py +++ b/ranger/container/history.py @@ -8,6 +8,7 @@ class HistoryEmptyException(Exception): class History(object): def __init__(self, maxlen=None, unique=True): + assert maxlen is not None, "maxlen cannot be None" if isinstance(maxlen, History): self._history = list(maxlen._history) self._index = maxlen._index |