python-coveralls KeyError number

What do the KeyErrors mean I see KeyError 25952 and few other numbers not what the mean any help will be appreciated, thanks. Error we are having:

Traceback (most recent call last): File "/Users/joseph/Documents/WebDevWorkspace/backend_api/venv3/bin/coveralls", line 11, in sys.exit(wear()) File "/Users/joseph/Documents/WebDevWorkspace/backend_api/venv3/lib/python3.6/site-packages/coveralls/init.py", line 94, in wear source_files=coverage.coveralls(args.base_dir, ignore_errors=args.ignore_errors, merge_file=args.merge_file), File "/Users/joseph/Documents/WebDevWorkspace/backend_api/venv3/lib/python3.6/site-packages/coveralls/control.py", line 9, in coveralls return reporter.report(base_dir, ignore_errors=ignore_errors, merge_file=merge_file) File "/Users/joseph/Documents/WebDevWorkspace/backend_api/venv3/lib/python3.6/site-packages/coveralls/report.py", line 23, in report analysis = self.coverage._analyze(fr) File "/Users/joseph/Documents/WebDevWorkspace/backend_api/venv3/lib/python3.6/site-packages/coverage/control.py", line 891, in _analyze return Analysis(self.data, it) File "/Users/joseph/Documents/WebDevWorkspace/backend_api/venv3/lib/python3.6/site-packages/coverage/results.py", line 28, in init self._arc_possibilities = sorted(self.file_reporter.arcs()) File "/Users/joseph/Documents/WebDevWorkspace/backend_api/venv3/lib/python3.6/site-packages/coverage/python.py", line 165, in arcs return self.parser.arcs() File "/Users/joseph/Documents/WebDevWorkspace/backend_api/venv3/lib/python3.6/site-packages/coverage/parser.py", line 238, in arcs for l1, l2 in self.byte_parser._all_arcs(): File "/Users/joseph/Documents/WebDevWorkspace/backend_api/venv3/lib/python3.6/site-packages/coverage/parser.py", line 624, in _all_arcs arcs.update(bp._arcs()) File "/Users/joseph/Documents/WebDevWorkspace/backend_api/venv3/lib/python3.6/site-packages/coverage/parser.py", line 590, in _arcs next_chunk = byte_chunks[ex] KeyError: 25952

Just from running coveralls