Error

[02:50:57 ERROR]: Could not pass event InventoryCreativeEvent to IslandRate v1.2.1-BETA
org.bukkit.event.EventException: null
        at org.bukkit.plugin.EventExecutor$2.execute(EventExecutor.java:72) ~[patched_1.12.2.jar:git-Paper-1370]
        at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:78) ~[patched_1.12.2.jar:git-Paper-1370]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[patched_1.12.2.jar:git-Paper-1370]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:515) ~[patched_1.12.2.jar:git-Paper-1370]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:500) ~[patched_1.12.2.jar:git-Paper-1370]
        at net.minecraft.server.v1_12_R1.PlayerConnection.a(PlayerConnection.java:2137) ~[patched_1.12.2.jar:git-Paper-1370]
        at net.minecraft.server.v1_12_R1.PacketPlayInSetCreativeSlot.a(SourceFile:23) ~[patched_1.12.2.jar:git-Paper-1370]
        at net.minecraft.server.v1_12_R1.PacketPlayInSetCreativeSlot.a(SourceFile:9) ~[patched_1.12.2.jar:git-Paper-1370]
        at net.minecraft.server.v1_12_R1.PlayerConnectionUtils.lambda$ensureMainThread$0(PlayerConnectionUtils.java:14) ~[patched_1.12.2.jar:git-Paper-1370]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_151]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_151]
        at net.minecraft.server.v1_12_R1.SystemUtils.a(SourceFile:46) [patched_1.12.2.jar:git-Paper-1370]
        at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:843) [patched_1.12.2.jar:git-Paper-1370]
        at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:426) [patched_1.12.2.jar:git-Paper-1370]
        at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:767) [patched_1.12.2.jar:git-Paper-1370]
        at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:665) [patched_1.12.2.jar:git-Paper-1370]
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_151]
Caused by: java.lang.NullPointerException
        at com.yovez.islandrate.RateMenu.getStar(RateMenu.java:67) ~[?:?]
        at com.yovez.islandrate.RateMenu.getInv(RateMenu.java:79) ~[?:?]
        at com.yovez.islandrate.EventListener.onInventoryClick(EventListener.java:36) ~[?:?]
        at com.destroystokyo.paper.event.executor.asm.generated.GeneratedEventExecutor362.execute(Unknown Source) ~[?:?]
        at org.bukkit.plugin.EventExecutor$2.execute(EventExecutor.java:70) ~[patched_1.12.2.jar:git-Paper-1370]
        ... 16 more