ERROR BEDWARSLOBBY type

[12:45:08 WARN]: Exception in thread "Craft Scheduler Thread - 21"
[12:45:08 WARN]: org.apache.commons.lang.UnhandledException: Plugin BedWarsLobby v1.4 generated an exception while executing task 1037
        at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:56)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.NullPointerException
        at org.bukkit.Location.getBlock(Location.java:87)
        at com.andrei1058.bedwarslobby.arena.ArenaData.addSign(ArenaData.java:49)
        at com.andrei1058.bedwarslobby.arena.ArenaData.registerSigns(ArenaData.java:233)
        at com.andrei1058.bedwarslobby.arena.ArenaData.<init>(ArenaData.java:44)
        at com.andrei1058.bedwarslobby.task.LobbySocket$ClientHandler.run(LobbySocket.java:59)
        at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftTask.run(CraftTask.java:71)
        at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:53)
        ... 3 more

[12:46:28 WARN]: Exception in thread "Craft Scheduler Thread - 24"
[12:46:28 WARN]: org.apache.commons.lang.UnhandledException: Plugin BedWarsLobby v1.4 generated an exception while executing task 1180
        at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:56)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.NullPointerException
        at org.bukkit.Location.getBlock(Location.java:87)
        at com.andrei1058.bedwarslobby.arena.ArenaData.addSign(ArenaData.java:49)
        at com.andrei1058.bedwarslobby.arena.ArenaData.registerSigns(ArenaData.java:233)
        at com.andrei1058.bedwarslobby.arena.ArenaData.<init>(ArenaData.java:44)
        at com.andrei1058.bedwarslobby.task.LobbySocket$ClientHandler.run(LobbySocket.java:59)
        at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftTask.run(CraftTask.java:71)
        at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:53)
        ... 3 more

[12:46:41 INFO]: KrustyMini issued server command: /bw guild
[12:46:45 INFO]: KrustyMini issued server command: /bw build
[12:49:23 WARN]: Exception in thread "Craft Scheduler Thread - 23"
[12:49:23 WARN]: org.apache.commons.lang.UnhandledException: Plugin BedWarsLobby v1.4 generated an exception while executing task 1416
        at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:56)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.NullPointerException
        at org.bukkit.Location.getBlock(Location.java:87)
        at com.andrei1058.bedwarslobby.arena.ArenaData.addSign(ArenaData.java:49)
        at com.andrei1058.bedwarslobby.arena.ArenaData.registerSigns(ArenaData.java:233)
        at com.andrei1058.bedwarslobby.arena.ArenaData.<init>(ArenaData.java:44)
        at com.andrei1058.bedwarslobby.task.LobbySocket$ClientHandler.run(LobbySocket.java:59)
        at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftTask.run(CraftTask.java:71)
        at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:53)
        ... 3 more