app stuttered before closing, then crashed, throwing error.

[Jason Coal]

bzr: ERROR: bdb.BdbQuit:

Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/bzrlib/plugins/explorer/lib/builders/toolset_builders.py", line 523, in open_callback
    def open_callback():
  File "/usr/lib/python2.7/dist-packages/bzrlib/breakin.py", line 43, in _debug
    signal.signal(_breakin_signal_number, _debug)
  File "/usr/lib/python2.7/dist-packages/bzrlib/breakin.py", line 43, in _debug
    signal.signal(_breakin_signal_number, _debug)
  File "/usr/lib/python2.7/bdb.py", line 49, in trace_dispatch
    return self.dispatch_line(frame)
  File "/usr/lib/python2.7/bdb.py", line 68, in dispatch_line
    if self.quitting: raise BdbQuit
BdbQuit

bzr 2.8.0dev1 on python 2.7.15rc1 (linux2)
arguments: ['/usr/bin/bzr', 'explorer']
encoding: 'utf-8', fsenc: 'UTF-8', lang: 'en_US.UTF-8'
plugins:
  bash_completion /usr/lib/python2.7/dist-packages/bzrlib/plugins/bash_completion [2.8.0dev1]
  changelog_merge /usr/lib/python2.7/dist-packages/bzrlib/plugins/changelog_merge [2.8.0dev1]
  explorer /usr/lib/python2.7/dist-packages/bzrlib/plugins/explorer [1.3.0]
  grep /usr/lib/python2.7/dist-packages/bzrlib/plugins/grep [2.8.0dev1]
  launchpad /usr/lib/python2.7/dist-packages/bzrlib/plugins/launchpad [2.8.0dev1]
  netrc_credential_store /usr/lib/python2.7/dist-packages/bzrlib/plugins/netrc_credential_store [2.8.0dev1]
  news_merge /usr/lib/python2.7/dist-packages/bzrlib/plugins/news_merge [2.8.0dev1]
  po_merge /usr/lib/python2.7/dist-packages/bzrlib/plugins/po_merge [2.8.0dev1]
  qbzr /usr/lib/python2.7/dist-packages/bzrlib/plugins/qbzr [0.23.2]
  weave_fmt /usr/lib/python2.7/dist-packages/bzrlib/plugins/weave_fmt [2.8.0dev1]

[Jason Coal (professorcoal)]

Still a noob to Programming here, despite having worked with Linux for about two years now.