[22:13:25 WARN]: [StainyCase] Task #720950 for StainyCase v1.0 generated an exception
java.lang.NullPointerException
        at ru.enervate.stainycode.cases.OpenRunnable.run(OpenRunnable.java:50) ~[?:?]
        at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftTask.run(CraftTask.java:71) ~[Spigot.jar:git-Spigot-db6de12-3f3c65f]
        at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:350) [Spigot.jar:git-Spigot
-db6de12-3f3c65f]
        at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:723) [Spigot.jar:git-Spigot-db6de12-3f3c65f]
        at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374) [Spigot.jar:git-Spigot-db6de12-3f3c65f]
        at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:654) [Spigot.jar:git-Spigot-db6de12-3f3c65f]
        at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:557) [Spigot.jar:git-Spigot-db6de12-3f3c65f]
        at java.lang.Thread.run(Thread.java:745) [?:1.8.0_66]