Crash on player logout

[dannydjdk]

Brief explanation of issue: Minecraft server crashes periodically when a server disconnects from the server, apparently while attempting to print the "playerX left the game" message to Discord.

Steps to reproduce: Have not been able to determine exact circumstances to reproduce. Crash is intermittent and does not happen at every disconnection, but happens several times a day.

Link to crash report: https://pastebin.com/FjfZUfbX

DiscordChat version: 2.3.0 Minecraft version: 1.12.2 Forge version: 14.23.1.2555

[Pirog17000]

Description: Exception in server tick loop

java.lang.NullPointerException: Exception in server tick loop
    at net.shadowfacts.discordchat.core.DiscordChat.sendMessage(DiscordChat.java:216)
    at net.shadowfacts.discordchat.core.DiscordChat.sendMessage(DiscordChat.java:247)
    at net.shadowfacts.discordchat.one_twelve_two.ForgeEventHandler.onPlayerLoggedOut(ForgeEventHandler.java:41)
    at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_204_ForgeEventHandler_onPlayerLoggedOut_PlayerLoggedOutEvent.invoke(.dynamic)
    at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90)
    at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:179)
    at net.minecraftforge.fml.common.FMLCommonHandler.firePlayerLoggedOut(FMLCommonHandler.java:579)
    at net.minecraft.server.management.PlayerList.func_72367_e(PlayerList.java:387)
    at net.minecraft.network.NetHandlerPlayServer.func_147231_a(NetHandlerPlayServer.java:849)
    at net.minecraft.network.NetworkManager.func_179293_l(NetworkManager.java:457)
    at net.minecraft.network.NetworkSystem.func_151269_c(NetworkSystem.java:213)
    at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:788)
    at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:396)
    at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:666)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:524)
    at java.lang.Thread.run(Thread.java:748)

Same here. Got crash on logout.