Node service stops during node key validation

Nov 07 07:45:08 1c31f9a17571 env[7897]:   File "/usr/local/lib/python3.5/dist-packages/stp_core/network/keep_in_touch.py", line 45, in serviceLifecycle
Nov 07 07:45:08 1c31f9a17571 env[7897]:     self.maintainConnections()
Nov 07 07:45:08 1c31f9a17571 env[7897]:   File "/usr/local/lib/python3.5/dist-packages/stp_zmq/kit_zstack.py", line 64, in maintainConnections
Nov 07 07:45:08 1c31f9a17571 env[7897]:     missing = self.connectToMissing()
Nov 07 07:45:08 1c31f9a17571 env[7897]:   File "/usr/local/lib/python3.5/dist-packages/stp_zmq/kit_zstack.py", line 120, in connectToMissing
Nov 07 07:45:08 1c31f9a17571 env[7897]:     self.connect(name, ha=self.registry[name])
Nov 07 07:45:08 1c31f9a17571 env[7897]:   File "/usr/local/lib/python3.5/dist-packages/stp_zmq/zstack.py", line 599, in connect
Nov 07 07:45:08 1c31f9a17571 env[7897]:     publicKeyRaw) if publicKeyRaw else self.getPublicKey(name)
Nov 07 07:45:08 1c31f9a17571 env[7897]:   File "/usr/local/lib/python3.5/dist-packages/stp_zmq/zstack.py", line 892, in getPublicKey
Nov 07 07:45:08 1c31f9a17571 env[7897]:     raise PublicKeyNotFoundOnDisk(self.name, name)
Nov 07 07:45:08 1c31f9a17571 env[7897]: stp_core.network.exceptions.PublicKeyNotFoundOnDisk: Node2 could not get Node8's public key from disk. Make sure the keys are initialized for this r
Nov 07 07:45:08 1c31f9a17571 systemd[1]: indy-node.service: Main process exited, code=exited, status=1/FAILURE
Nov 07 07:45:08 1c31f9a17571 systemd[1]: indy-node.service: Unit entered failed state.
Nov 07 07:45:08 1c31f9a17571 systemd[1]: indy-node.service: Failed with result 'exit-code'.
Nov 07 07:45:18 1c31f9a17571 systemd[1]: indy-node.service: Service hold-off time over, scheduling restart.
Nov 07 07:45:18 1c31f9a17571 systemd[1]: Stopped Indy Node.