after running server short period it seems netty stops working.

So no players can connect or stay connected.

[13:08:44] Netty Server IO #0/WARN: Selector.select() returned prematurely 512 times in a row; rebuilding Selector io.netty.channel.nio.SelectedSelectionKeySetSelector@3ad3a920.
[13:08:44] Netty Server IO #0/WARN: Failed to re-register a Channel to the new Selector.
java.lang.ClassCastException: io.netty.channel.nio.SelectedSelectionKeySetSelector cannot be cast to java.nio.channels.spi.AbstractSelector
    at java.nio.channels.spi.AbstractSelectableChannel.register(Unknown Source) ~[?:1.8.0_131]
    at io.netty.channel.nio.NioEventLoop.rebuildSelector0(NioEventLoop.java:347) [spigot-1.12-R0.1-SNAPSHOT.jar:git-Spigot-7228328-6659ddf]
    at io.netty.channel.nio.NioEventLoop.rebuildSelector(NioEventLoop.java:318) [spigot-1.12-R0.1-SNAPSHOT.jar:git-Spigot-7228328-6659ddf]
    at io.netty.channel.nio.NioEventLoop.select(NioEventLoop.java:769) [spigot-1.12-R0.1-SNAPSHOT.jar:git-Spigot-7228328-6659ddf]
    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:388) [spigot-1.12-R0.1-SNAPSHOT.jar:git-Spigot-7228328-6659ddf]
    at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:858) [spigot-1.12-R0.1-SNAPSHOT.jar:git-Spigot-7228328-6659ddf]
    at java.lang.Thread.run(Unknown Source) [?:1.8.0_131]