Checkbox is reporting an error in the logs by default

When running checkbox after a default installation, the following stack trace appears in the log files:

2010-04-12 16:21:42,861 ERROR Error running event handler None.RecoverPrompt.prompt_begin() for event type 'prompt-begin' with args (<checkbox_gtk.gtk_interface.GTKInterface object at 0x201ced0>,) {}.
Traceback (most recent call last):
  File "/srv/trunk.certification.canonical.com/checkbox/checkbox/reactor.py", line 70, in fire
    results.append(handler(*args, **kwargs))
  File "./plugins/recover_prompt.py", line 41, in prompt_begin
    and self.persist.get("recover", False):
AttributeError: 'RecoverPrompt' object has no attribute 'persist'

This does not appear to affect the initial running of checkbox, but it prevents recovering from a previous run.