[06:44:12] [Server thread/INFO]: World generation is now at 4.95%. (230516/4652649 chunks processed)
[06:44:15] [Server Watchdog/FATAL]: A single server tick took 60.00 seconds (should be max 0.05)
[06:44:15] [Server Watchdog/FATAL]: Considering it to be crashed, server will forcibly shutdown.
[06:44:15] [pool-3-thread-69/INFO]: [ClearLag] Ground items will be cleared in 30 seconds.
[06:44:15] [Server Watchdog/ERROR]: This crash report has been saved to: /home/minecraft/multicraft/servers/server56/./crash-reports/crash-2018-02-18_06.44.15-server.txt
[06:44:15] [Server Shutdown Thread/INFO]: Stopping server
[06:44:15] [Server Shutdown Thread/INFO]: Saving players
[06:44:15] [Server Shutdown Thread/INFO]: Saving worlds
[06:44:15] [Server thread/ERROR]: Encountered an unexpected exception
java.lang.NullPointerException: null
	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:782) ~[MinecraftServer.class:?]
	at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:396) ~[nz.class:?]
	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:666) ~[MinecraftServer.class:?]
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:524) [MinecraftServer.class:?]
	at java.lang.Thread.run(Thread.java:748) [?:1.8.0_161]