NPE when trying to get wrapped token

[VladRassokhin]

[2017-11-27 12:16:44,634]   WARN - aultBuildStartContextProcessor - Failed to fetch HashiCorp Vault wrapped token: null 
java.lang.NullPointerException
	at org.jetbrains.teamcity.vault.server.VaultConnector$Companion.doRequestWrappedToken(VaultConnector.kt:162)
	at org.jetbrains.teamcity.vault.server.VaultConnector.requestWrappedToken(VaultConnector.kt:246)
	at org.jetbrains.teamcity.vault.server.VaultBuildStartContextProcessor.updateParameters(VaultBuildStartContextProcessor.kt:51)
	at jetbrains.buildServer.serverSide.impl.RunningBuildImpl.prepareRunners(RunningBuildImpl.java:1247)
	at jetbrains.buildServer.serverSide.impl.RunningBuildImpl.createAgentBuild(RunningBuildImpl.java:1037)
	at jetbrains.buildServer.serverSide.impl.BuildStarter$1.run(BuildStarter.java:132)
	at jetbrains.buildServer.serverSide.impl.BuildStarter$2$1.run(BuildStarter.java:165)
	at jetbrains.buildServer.util.NamedThreadFactory.executeWithNewThreadName(NamedThreadFactory.java:71)
	at jetbrains.buildServer.serverSide.impl.BuildStarter$2.run(BuildStarter.java:163)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)