Dependency resolving fails due to directory lock not found

2019-03-12 14:04:57,535 ERROR:dependency(26365): Failed to resolve dependencies
ESC[31mTraceback (most recent call last):
  File "/home/vmbuilder/qt-ci/src/dependency.py", line 62, in get_submodule_dependencies
    resolvedRepositories = await self._resolve_repositories(modules, superRepo)
  File "/home/vmbuilder/qt-ci/src/dependency.py", line 70, in _resolve_repositories
    submodules = await self.repoManager.readSubModules(superRepo)
  File "/home/vmbuilder/qt-ci/src/repositorymanager.py", line 615, in readSubModules
    await asyncio.gather(*(resolve_submodule(submodule) for submodule in modules.values() if not submodule.get('sha1')))
  File "/home/vmbuilder/qt-ci/src/repositorymanager.py", line 596, in resolve_submodule
    ls_tree = await git("ls-tree", sha1, "--", submodule["path"])
  File "/home/vmbuilder/qt-ci/src/repositorymanager.py", line 283, in __call__
    raise
  File "/home/vmbuilder/qt-ci/src/utils.py", line 582, in __aexit__
    local_lock = DirectoryLock.Local_locks[self.path]
KeyError: '/home/vmbuilder/ci-working-dir/git-repos/qt-project/qt/qt5.lock'ESC[0m
2019-03-12 14:04:57,539 ERROR:workitemfactory(26365): Creation of work items failed
ESC[31mTraceback (most recent call last):
  File "/home/vmbuilder/qt-ci/src/workitemfactory.py", line 425, in _testChange
    raise Exception(result.errorMessage)
Exception: '/home/vmbuilder/ci-working-dir/git-repos/qt-project/qt/qt5.lock'ESC[0m
2019-03-12 14:04:57,540 DEBUG:scheduler(26365): Cancelling 1552401442