This problem is produced when i buy something from the shop.

Output:

[06:19:12] [Server thread/ERROR]: Could not pass event TransactionEvent to SDFEconomy v3.2
org.bukkit.event.EventException
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302) ~[start.jar:git-Bukkit-e91aed8]
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[start.jar:git-Bukkit-e91aed8]
at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:501) [start.jar:git-Bukkit-e91aed8]
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:486) [start.jar:git-Bukkit-e91aed8]
at com.Acrobot.ChestShop.Listeners.Player.PlayerInteract.onInteract(PlayerInteract.java:111) [ChestShop.jar]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0_79]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) ~[?:1.7.0_79]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.7.0_79]
at java.lang.reflect.Method.invoke(Method.java:606) ~[?:1.7.0_79]
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:300) [start.jar:git-Bukkit-e91aed8]
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) [start.jar:git-Bukkit-e91aed8]
at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:501) [start.jar:git-Bukkit-e91aed8]
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:486) [start.jar:git-Bukkit-e91aed8]
at org.bukkit.craftbukkit.v1_8_R3.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:210) [start.jar:git-Bukkit-e91aed8]
at net.minecraft.server.v1_8_R3.PlayerInteractManager.interact(PlayerInteractManager.java:462) [start.jar:git-Bukkit-e91aed8]
at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:705) [start.jar:git-Bukkit-e91aed8]
at net.minecraft.server.v1_8_R3.PacketPlayInBlockPlace.a(PacketPlayInBlockPlace.java:52) [start.jar:git-Bukkit-e91aed8]
at net.minecraft.server.v1_8_R3.PacketPlayInBlockPlace.a(PacketPlayInBlockPlace.java:1) [start.jar:git-Bukkit-e91aed8]
at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13) [start.jar:git-Bukkit-e91aed8]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) [?:1.7.0_79]
at java.util.concurrent.FutureTask.run(FutureTask.java:262) [?:1.7.0_79]
at net.minecraft.server.v1_8_R3.SystemUtils.a(SystemUtils.java:19) [start.jar:git-Bukkit-e91aed8]
at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:676) [start.jar:git-Bukkit-e91aed8]
at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:335) [start.jar:git-Bukkit-e91aed8]
at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:632) [start.jar:git-Bukkit-e91aed8]
at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:540) [start.jar:git-Bukkit-e91aed8]
at java.lang.Thread.run(Thread.java:745) [?:1.7.0_79]
Caused by: java.lang.NullPointerException
at java.util.concurrent.ConcurrentHashMap.hash(ConcurrentHashMap.java:333) ~[?:1.7.0_79]
at java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:988) ~[?:1.7.0_79]
at com.github.omwah.SDFEconomy.location.SetDestinationLocationTranslator.removeDestination(SetDestinationLocationTranslator.java:40) ~[?:?]
at com.github.omwah.SDFEconomy.listener.ChestShopEventListener.onTransactionEvent(ChestShopEventListener.java:46) ~[?:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0_79]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) ~[?:1.7.0_79]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.7.0_79]
at java.lang.reflect.Method.invoke(Method.java:606) ~[?:1.7.0_79]
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:300) ~[start.jar:git-Bukkit-e91aed8]
... 26 more

ChestShop 3.8.11

Spigot 1.8.7

SDFEconomy 3.2