My server crashed with this message.
Sorry this is my second github message.

[19:56:54] [Server thread/INFO]: Liamtjuhh lost connection: Server closed
[19:56:54] [Server thread/INFO]: Removing Liamtjuhh from scheduled checklists: Player disconnected.
[19:56:54] [Server thread/INFO]: Liamtjuhh left the game.
[19:56:54] [Server thread/INFO]: zee123478 lost connection: Server closed
[19:56:54] [Server thread/INFO]: Removing zee123478 from scheduled checklists: Player disconnected.
[19:56:54] [Server thread/INFO]: Unknown net.minecraftforge.common.chunkio.QueuedChunk {
x: -144
z: -501
loader: null
world: World
dimension: 0
provider: biomesoplenty.common.world.WorldProviderSurfaceBOP
}
[19:56:54] [Server thread/INFO]: This should not happen. Please report this error to Forge.
[19:56:54] [Server thread/INFO]: Unknown net.minecraftforge.common.chunkio.QueuedChunk {
x: -144
z: -501
loader: null
world: World
dimension: 0
provider: biomesoplenty.common.world.WorldProviderSurfaceBOP
}
[19:56:54] [Server thread/INFO]: This should not happen. Please report this error to Forge.
[19:56:54] [Server thread/INFO]: zee123478 left the game.
[19:56:54] [Server thread/INFO]: Saving worlds
[19:56:54] [Server thread/INFO]: Saving chunks for level 'World'/Overworld
[19:56:58] [Server thread/INFO]: Saving chunks for level 'DIM-100'/Underdark
[19:56:58] [Server thread/INFO]: Saving chunks for level 'DIM1'/The End
[19:56:58] [Server thread/INFO]: Saving chunks for level 'DIM-1'/Nether
[19:56:58] [Server thread/INFO]: Saving chunks for level 'DIM-112'/The Last Millenium
[19:56:58] [Server thread/INFO]: Unloading dimension 0
[19:56:58] [Server thread/INFO]: Unloading dimension -1
[19:56:58] [Server thread/INFO]: Unloading dimension 1
[19:56:58] [Server thread/INFO]: Unloading dimension -100
[19:56:58] [Server thread/INFO]: Unloading dimension -112
[19:56:58] [Server thread/INFO]: Applying holder lookups
[19:56:58] [Server thread/INFO]: Holder lookups applied
[19:56:58] [net.gliby.voicechat.common.networking.voiceservers.udp.UdpServer/INFO]: Udp Server closed normally.
[19:56:58] [Server thread/INFO]: Stopped Voice Server.
[19:56:58] [Server thread/INFO]: Completed server-stop actions.

This isn't a crash log, and though our world provider is listed as associated with the chunks,it doesn't suggest it's necessarily at fault. You've also ignored the issue template and left out a lot of information... There's not really much that can be done if we don't really have any information to go off of...