Unhandled exception when build is cancelled

2018-10-02 08:25:40,062 DEBUG:opennebulahardwarepool(14069): Dispose VM: 1525575, buildKey: qt/qtbase/b690a213b59ce62f7da6c3ead41409c60febe8e1/WindowsWindows_10x86_64WinRTWinRT_10armv7MSVC2015qtci-windows-10-x86_64-10-2b65d8DebugAndRelease_Release_ForceDebugInfo_DisableTests/2a48a3b7dcb9652b1532a3ad14de7580b5b9b1ee/Build, agent: 1538784386-15826
 2018-10-02 08:25:40,063 ERROR:workitem(14069): Houston? Houston!
 ESC[31mTraceback (most recent call last):
 File "/home/vmbuilder/qt-ci/src/workitem.py", line 527, in _build
 done, pending = await asyncio.wait((self.agentFinishedFuture, agentHeartbeatFuture), timeout=await self.runningTimeout, loop=self.loop, return_when=asyncio.FIRST_COMPLETED) # type: ignore
 File "/usr/lib/python3.6/asyncio/tasks.py", line 313, in wait return (yield from _wait(fs, timeout, return_when, loop))
 File "/usr/lib/python3.6/asyncio/tasks.py", line 396, in _wait
 yield from waiter
 concurrent.futures._base.CancelledErrorDuring handling of the above exception, another exception occurred:Traceback (most recent call last):
 File "/home/vmbuilder/qt-ci/src/workitem.py", line 276, in _run
 await self.run()
 File "/home/vmbuilder/qt-ci/src/workitem.py", line 820, in run
 await self._build()
 File "/home/vmbuilder/qt-ci/src/workitem.py", line 530, in _build
 async with application.connectToAgent(agent.address) as agentRpcClient:
 File "/home/vmbuilder/qt-ci/src/application.py", line 632, in _aenter_
 raise last_exception
 File "/home/vmbuilder/qt-ci/src/application.py", line 625, in _aenter_ return context._enter_(*args, **keys)
 File "/usr/lib/python3.6/contextlib.py", line 81, in _enter_ return next(self.gen)
 File "/home/vmbuilder/qt-ci/env/lib/python3.6/site-packages/thriftpy/rpc.py", line 74, in client_context
 transport.open()
 File "/home/vmbuilder/qt-ci/env/lib/python3.6/site-packages/thriftpy/transport/transport.py", line 113, in open return self.__trans.open()
 File "/home/vmbuilder/qt-ci/env/lib/python3.6/site-packages/thriftpy/transport/socket.py", line 82, in open
 message=message)
 thriftpy.transport.transport.TTransportException: TTransportException(type=1, message='Could not connect to 10.215.196.81:49814')ESC[0m
 2018-10-02 08:25:40,075 DEBUG:workitem(14069): Work item (buildKey: qt/qtbase/b690a213b59ce62f7da6c3ead41409c60febe8e1/WindowsWindows_10x86_64WinRTWinRT_10armv7MSVC2015qtci-windows-10-x86_64-10-2b65d8DebugAndRelease_Release_ForceDebugInfo_DisableTests/2a48a3b7dcb9652b1532a3ad14de7580b5b9b1ee/Build) changed state from Running to Failed