MySQL Connection problem - BedWarsProxy1.2.4 Plugin

When I start the Lobby server and a player enters the server it shows an error message in the console:

```
[15:55:38] [Craft Scheduler Thread - 1/WARN]: Exception in thread "Craft Scheduler Thread - 1"
[15:55:38] [Craft Scheduler Thread - 1/WARN]: org.apache.commons.lang.UnhandledException: Plugin BedWarsProxy v${gitVer}1.2.4 generated an exception while executing task 437
at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:56)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.NullPointerException
at com.andrei1058.bedwars.proxy.database.CacheListener.lambda$0(CacheListener.java:21)
at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftTask.run(CraftTask.java:59)
at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:53)
... 3 more

[15:55:38] [Craft Scheduler Thread - 19/WARN]: Exception in thread "Craft Scheduler Thread - 19"
[15:55:38] [Craft Scheduler Thread - 19/WARN]: org.apache.commons.lang.UnhandledException: Plugin BedWarsProxy v${gitVer}1.2.4 generated an exception while executing task 436
at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:56)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.NullPointerException
at com.andrei1058.bedwars.proxy.language.LangListeners.lambda$0(LangListeners.java:26)
at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftTask.run(CraftTask.java:59)
at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:53)
... 3 more

[15:55:38] [Craft Scheduler Thread - 26/WARN]: Exception in thread "Craft Scheduler Thread - 26"
[15:55:38] [Craft Scheduler Thread - 26/WARN]: org.apache.commons.lang.UnhandledException: Plugin BedWarsProxy v${gitVer}1.2.4 generated an exception while executing task 451
at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:56)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.NullPointerException
at com.andrei1058.bedwars.proxy.levels.internal.LevelListeners.lambda$0(LevelListeners.java:29)
at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftTask.run(CraftTask.java:59)
at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:53)
... 3 more
```