AuctionsError

[Server thread/INFO]: MrHollick issued server command: /auction start 64 64
[Server thread/ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'auction' in plugin Auctions v2.4.2-SNAPSHOT
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:47) ~[patched_1.9.4.jar:git-Paper-754]
	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:152) ~[patched_1.9.4.jar:git-Paper-754]
	at org.bukkit.craftbukkit.v1_9_R2.CraftServer.dispatchCommand(CraftServer.java:665) ~[patched_1.9.4.jar:git-Paper-754]
	at net.minecraft.server.v1_9_R2.PlayerConnection.handleCommand(PlayerConnection.java:1387) [patched_1.9.4.jar:git-Paper-754]
	at net.minecraft.server.v1_9_R2.PlayerConnection.a(PlayerConnection.java:1192) [patched_1.9.4.jar:git-Paper-754]
	at net.minecraft.server.v1_9_R2.PacketPlayInChat.a(PacketPlayInChat.java:45) [patched_1.9.4.jar:git-Paper-754]
	at net.minecraft.server.v1_9_R2.PacketPlayInChat.a(PacketPlayInChat.java:5) [patched_1.9.4.jar:git-Paper-754]
	at net.minecraft.server.v1_9_R2.PlayerConnectionUtils$1.run(SourceFile:13) [patched_1.9.4.jar:git-Paper-754]
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_77]
	at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_77]
	at net.minecraft.server.v1_9_R2.SystemUtils.a(SourceFile:45) [patched_1.9.4.jar:git-Paper-754]
	at net.minecraft.server.v1_9_R2.MinecraftServer.D(MinecraftServer.java:786) [patched_1.9.4.jar:git-Paper-754]
	at net.minecraft.server.v1_9_R2.DedicatedServer.D(DedicatedServer.java:403) [patched_1.9.4.jar:git-Paper-754]
	at net.minecraft.server.v1_9_R2.MinecraftServer.C(MinecraftServer.java:723) [patched_1.9.4.jar:git-Paper-754]
	at net.minecraft.server.v1_9_R2.MinecraftServer.run(MinecraftServer.java:622) [patched_1.9.4.jar:git-Paper-754]
	at java.lang.Thread.run(Thread.java:745) [?:1.8.0_77]
Caused by: java.lang.NullPointerException
	at com.sainttx.auctions.command.subcommand.StartCommand.onCommand(StartCommand.java:77) ~[?:?]
	at com.sainttx.auctions.command.AuctionCommandHandler.onCommand(AuctionCommandHandler.java:99) ~[?:?]
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:45) ~[patched_1.9.4.jar:git-Paper-754]
	... 15 more