NPE during rules mining

[olegs]

[Jul 11, 2019 17:40:07] fishbone rules saved to /Users/oleg/fishbone/ciofani_output/_fishbone_rules_2019_07_11_17:40:06.csv
17:40:07.526 [nettyCallPool-4-2] ERROR ktor.application - Unhandled: GET - /rules
kotlin.KotlinNullPointerException: null
	at org.jetbrains.bio.FishboneApp$run$server$1$3$1$1.invokeSuspend(FishboneApp.kt:62)
	at org.jetbrains.bio.FishboneApp$run$server$1$3$1$1.invoke(FishboneApp.kt)
	at io.ktor.util.pipeline.SuspendFunctionGun.loop(PipelineContext.kt:278)
	at io.ktor.util.pipeline.SuspendFunctionGun.access$loop(PipelineContext.kt:63)
	at io.ktor.util.pipeline.SuspendFunctionGun.proceed(PipelineContext.kt:137)
	at io.ktor.util.pipeline.SuspendFunctionGun.execute(PipelineContext.kt:157)
	at io.ktor.util.pipeline.Pipeline.execute(Pipeline.kt:23)
	at io.ktor.routing.Routing.executeResult(Routing.kt:148)
	at io.ktor.routing.Routing.interceptor(Routing.kt:29)
	at io.ktor.routing.Routing$Feature$install$1.invokeSuspend(Routing.kt:93)
	at io.ktor.routing.Routing$Feature$install$1.invoke(Routing.kt)
	at io.ktor.util.pipeline.SuspendFunctionGun.loop(PipelineContext.kt:278)
	at io.ktor.util.pipeline.SuspendFunctionGun.access$loop(PipelineContext.kt:63)
	at io.ktor.util.pipeline.SuspendFunctionGun.proceed(PipelineContext.kt:137)
	at io.ktor.features.ContentNegotiation$Feature$install$1.invokeSuspend(ContentNegotiation.kt:63)
	at io.ktor.features.ContentNegotiation$Feature$install$1.invoke(ContentNegotiation.kt)
	at io.ktor.util.pipeline.SuspendFunctionGun.loop(PipelineContext.kt:278)
	at io.ktor.util.pipeline.SuspendFunctionGun.access$loop(PipelineContext.kt:63)
	at io.ktor.util.pipeline.SuspendFunctionGun.proceed(PipelineContext.kt:137)
	at io.ktor.features.CallLogging$Feature$install$2.invokeSuspend(CallLogging.kt:130)
	at io.ktor.features.CallLogging$Feature$install$2.invoke(CallLogging.kt)
	at io.ktor.util.pipeline.SuspendFunctionGun.loop(PipelineContext.kt:278)
	at io.ktor.util.pipeline.SuspendFunctionGun.access$loop(PipelineContext.kt:63)
	at io.ktor.util.pipeline.SuspendFunctionGun.proceed(PipelineContext.kt:137)
	at io.ktor.util.pipeline.SuspendFunctionGun.execute(PipelineContext.kt:157)
	at io.ktor.util.pipeline.Pipeline.execute(Pipeline.kt:23)
	at io.ktor.server.engine.DefaultEnginePipelineKt$defaultEnginePipeline$2.invokeSuspend(DefaultEnginePipeline.kt:106)
	at io.ktor.server.engine.DefaultEnginePipelineKt$defaultEnginePipeline$2.invoke(DefaultEnginePipeline.kt)
	at io.ktor.util.pipeline.SuspendFunctionGun.loop(PipelineContext.kt:278)
	at io.ktor.util.pipeline.SuspendFunctionGun.access$loop(PipelineContext.kt:63)
	at io.ktor.util.pipeline.SuspendFunctionGun.proceed(PipelineContext.kt:137)
	at io.ktor.util.pipeline.SuspendFunctionGun.execute(PipelineContext.kt:157)
	at io.ktor.util.pipeline.Pipeline.execute(Pipeline.kt:23)
	at io.ktor.server.netty.NettyApplicationCallHandler$handleRequest$1.invokeSuspend(NettyApplicationCallHandler.kt:31)
	at io.ktor.server.netty.NettyApplicationCallHandler$handleRequest$1.invoke(NettyApplicationCallHandler.kt)
	at kotlinx.coroutines.intrinsics.UndispatchedKt.startCoroutineUndispatched(Undispatched.kt:55)
	at kotlinx.coroutines.CoroutineStart.invoke(CoroutineStart.kt:111)
	at kotlinx.coroutines.AbstractCoroutine.start(AbstractCoroutine.kt:160)
	at kotlinx.coroutines.BuildersKt__Builders_commonKt.launch(Builders.common.kt:54)
	at kotlinx.coroutines.BuildersKt.launch(Unknown Source)
	at io.ktor.server.netty.NettyApplicationCallHandler.handleRequest(NettyApplicationCallHandler.kt:22)
	at io.ktor.server.netty.NettyApplicationCallHandler.channelRead(NettyApplicationCallHandler.kt:16)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
	at io.netty.channel.AbstractChannelHandlerContext.access$600(AbstractChannelHandlerContext.java:38)
	at io.netty.channel.AbstractChannelHandlerContext$7.run(AbstractChannelHandlerContext.java:353)
	at io.netty.util.concurrent.AbstractEventExecutor.safeExecute$$$capture(AbstractEventExecutor.java:163)
	at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java)
	at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:404)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:463)
	at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:884)
	at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
	at java.lang.Thread.run(Thread.java:748)