Server Error

18.02 18:36:25 [Server] FATAL Error executing task
18.02 18:36:25 [Server] INFO java.util.concurrent.ExecutionException: java.lang.NullPointerException
18.02 18:36:25 [Server] INFO at java.util.concurrent.FutureTask.report(FutureTask.java:122) ~[?:1.8.0_191]
18.02 18:36:25 [Server] INFO at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[?:1.8.0_191]
18.02 18:36:25 [Server] INFO at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:45) [paper-1.8.8.jar:git-PaperSpigot-"4c7641d"]
18.02 18:36:25 [Server] INFO at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:774) [paper-1.8.8.jar:git-PaperSpigot-"4c7641d"]
18.02 18:36:25 [Server] INFO at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:378) [paper-1.8.8.jar:git-PaperSpigot-"4c7641d"]
18.02 18:36:25 [Server] INFO at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:713) [paper-1.8.8.jar:git-PaperSpigot-"4c7641d"]
18.02 18:36:25 [Server] INFO at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:616) [paper-1.8.8.jar:git-PaperSpigot-"4c7641d"]
18.02 18:36:25 [Server] INFO at java.lang.Thread.run(Thread.java:748) [?:1.8.0_191]
18.02 18:36:25 [Server] INFO Caused by: java.lang.NullPointerException
18.02 18:36:25 [Server] INFO at com.enjin.bukkit.util.LogFilter.filter(LogFilter.java:21) ~[?:?]
18.02 18:36:25 [Server] INFO at org.apache.logging.log4j.core.filter.AbstractFilterable.isFiltered(AbstractFilterable.java:124) ~[paper-1.8.8.jar:git-PaperSpigot-"4c7641d"]
18.02 18:36:25 [Server] INFO at org.apache.logging.log4j.core.config.AppenderControl.callAppender(AppenderControl.java:94) ~[paper-1.8.8.jar:git-PaperSpigot-"4c7641d"]
18.02 18:36:25 [Server] INFO at org.apache.logging.log4j.core.config.LoggerConfig.callAppenders(LoggerConfig.java:425) ~[paper-1.8.8.jar:git-PaperSpigot-"4c7641d"]
18.02 18:36:25 [Server] INFO at org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:406) ~[paper-1.8.8.jar:git-PaperSpigot-"4c7641d"]
18.02 18:36:25 [Server] INFO at org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:367) [paper-1.8.8.jar:git-PaperSpigot-"4c7641d"]
18.02 18:36:25 [Server] INFO at org.apache.logging.log4j.core.Logger.log(Logger.java:110) [paper-1.8.8.jar:git-PaperSpigot-"4c7641d"]
18.02 18:36:25 [Server] INFO at org.apache.logging.log4j.spi.AbstractLogger.error(AbstractLogger.java:609) [paper-1.8.8.jar:git-PaperSpigot-"4c7641d"]
18.02 18:36:25 [Server] INFO at org.bukkit.craftbukkit.v1_8_R3.util.ForwardLogHandler.publish(ForwardLogHandler.java:33) ~[paper-1.8.8.jar:git-PaperSpigot-"4c7641d"]
18.02 18:36:25 [Server] INFO at java.util.logging.Logger.log(Logger.java:738) ~[?:1.8.0_191]
18.02 18:36:25 [Server] INFO at java.util.logging.Logger.doLog(Logger.java:765) ~[?:1.8.0_191]
18.02 18:36:25 [Server] INFO at java.util.logging.Logger.log(Logger.java:876) ~[?:1.8.0_191]
18.02 18:36:25 [Server] INFO at net.minecraft.server.v1_8_R3.PlayerConnection.handleCommand(PlayerConnection.java:1195) ~[paper-1.8.8.jar:git-PaperSpigot-"4c7641d"]
18.02 18:36:25 [Server] INFO at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:1001) ~[paper-1.8.8.jar:git-PaperSpigot-"4c7641d"]
18.02 18:36:25 [Server] INFO at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(PacketPlayInChat.java:45) ~[paper-1.8.8.jar:git-PaperSpigot-"4c7641d"]
18.02 18:36:25 [Server] INFO at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(PacketPlayInChat.java:1) ~[paper-1.8.8.jar:git-PaperSpigot-"4c7641d"]
18.02 18:36:25 [Server] INFO at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13) ~[paper-1.8.8.jar:git-PaperSpigot-"4c7641d"]
18.02 18:36:25 [Server] INFO at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_191]
18.02 18:36:25 [Server] INFO at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_191]
18.02 18:36:25 [Server] INFO at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44) ~[paper-1.8.8.jar:git-PaperSpigot-"4c7641d"]
18.02 18:36:25 [Server] INFO ... 5 more