While running the ban uuid conversion the plugin freaks out.

14:35:49] [Server thread/ERROR]: Error occurred while enabling Essentials vTeamCity (Is it up to date?)
java.lang.NullPointerException
at com.earth2me.essentials.craftbukkit.BanLookup.getBanEntry(BanLookup.java:28) ~[?:?]
at com.earth2me.essentials.craftbukkit.BanLookup.isBanned(BanLookup.java:20) ~[?:?]
at com.earth2me.essentials.EssentialsUpgrade.banFormatChange(EssentialsUpgrade.java:733) ~[?:?]
at com.earth2me.essentials.EssentialsUpgrade.afterSettings(EssentialsUpgrade.java:778) ~[?:?]
at com.earth2me.essentials.Essentials.onEnable(Essentials.java:214) ~[?:?]
at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:321) ~[spigot.jar:git-Spigot-da32fe1-2422099]
at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:335) [spigot.jar:git-Spigot-da32fe1-2422099]
at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:405) [spigot.jar:git-Spigot-da32fe1-2422099]
at org.bukkit.craftbukkit.v1_8_R1.CraftServer.loadPlugin(CraftServer.java:352) [spigot.jar:git-Spigot-da32fe1-2422099]
at org.bukkit.craftbukkit.v1_8_R1.CraftServer.enablePlugins(CraftServer.java:313) [spigot.jar:git-Spigot-da32fe1-2422099]
at net.minecraft.server.v1_8_R1.MinecraftServer.q(MinecraftServer.java:402) [spigot.jar:git-Spigot-da32fe1-2422099]
at net.minecraft.server.v1_8_R1.MinecraftServer.k(MinecraftServer.java:370) [spigot.jar:git-Spigot-da32fe1-2422099]
at net.minecraft.server.v1_8_R1.MinecraftServer.a(MinecraftServer.java:325) [spigot.jar:git-Spigot-da32fe1-2422099]
at net.minecraft.server.v1_8_R1.DedicatedServer.init(DedicatedServer.java:211) [spigot.jar:git-Spigot-da32fe1-2422099]
at net.minecraft.server.v1_8_R1.MinecraftServer.run(MinecraftServer.java:498) [spigot.jar:git-Spigot-da32fe1-2422099]
at java.lang.Thread.run(Thread.java:745) [?:1.7.0_67]

This also messes up the Player uuid conversion :/
There is no way to restart the conversion process that I can find