java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at net.milkbowl.vault.permission.plugins.Permission_GroupManager.getPrimaryGroup(Permission_GroupManager.java:327)
at net.milkbowl.vault.permission.Permission.getPrimaryGroup(Permission.java:726)
at net.milkbowl.vault.permission.Permission.getPrimaryGroup(Permission.java:738)
at com.earth2me.essentials.perm.impl.AbstractVaultHandler.getGroup(AbstractVaultHandler.java:33)
at com.earth2me.essentials.perm.PermissionsHandler.getGroup(PermissionsHandler.java:28)
at com.earth2me.essentials.User.getGroup(User.java:622)
at com.earth2me.essentials.textreader.TextInput.(TextInput.java:28)
at com.earth2me.essentials.EssentialsPlayerListener.delayedJoin(EssentialsPlayerListener.java:209)
at com.earth2me.essentials.EssentialsPlayerListener$1.run(EssentialsPlayerListener.java:179)
at org.bukkit.craftbukkit.v1_11_R1.scheduler.CraftTask.run(CraftTask.java:53)
at org.bukkit.craftbukkit.v1_11_R1.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:52)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

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