java.util.ConcurrentModificationException: This exception has no message.

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at com.bluelinelabs.conductor.ControllerHostedRouter.removeHost(SourceFile:50)
at com.bluelinelabs.conductor.Controller.removeViewReference(SourceFile:790)
at com.bluelinelabs.conductor.Controller.destroy(SourceFile:879)
at com.bluelinelabs.conductor.Controller.destroy(SourceFile:868)
at com.bluelinelabs.conductor.Backstack.pop(SourceFile:55)
at com.bluelinelabs.conductor.Backstack.popAll(SourceFile:74)
at com.bluelinelabs.conductor.Router.setRoot(SourceFile:238)

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