org.bukkit.command.CommandException: Unhandled exception executing command 'startsg' in plugin SurvivalGames v1.0

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java.lang.NullPointerException:
at com.Pack.code.sg.gametime.LobbyChecker.stopChecker(LobbyChecker.java:34)
at com.Pack.sg.core.Start.startGame(Start.java:33)
at com.Pack.code.sg.commands.Commands.Command(Commands.java:25)
at com.Pack.code.sg.Main.onCommand(Main.java:45)
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44)
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141)
at org.bukkit.craftbukkit.v1_8_R3.CraftServer.dispatchCommand(CraftServer.java:641)
at net.minecraft.server.v1_8_R3.PlayerConnection.handleCommand(PlayerConnection.java:1162)
at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:997)
at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(PacketPlayInChat.java:45)
at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(PacketPlayInChat.java:1)
at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13)
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44)
at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:715)
at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374)
at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:654)
at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:557)
at java.lang.Thread.run(Unknown Source)

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