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kotlinlang

hey everyone, we get the following exception when running Detekt.
```
Running detekt 'unknown' on Java '1.8.0_144-b01' on OS 'Mac OS X'.
▸ Please create an issue and report this exception.
▸ java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:273)
▸ java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:280)
▸ java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1592)
▸ java.util.concurrent.CompletableFuture$AsyncSupply.exec(CompletableFuture.java:1582)
▸ java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)
▸ java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056)
▸ java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692)
▸ java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157)
```
I am not sure where to look for the cause. Does anyone have any idea?

<@U0MCQ3MBJ> please submit an issue on GitHub with the full stack trace and some more details (environment..)

Issue opened here <https://github.com/arturbosch/detekt/issues/1064>