this is with ONE furnace on and in use.

[13:41:08 WARN]: [EpicFurnaces] Task #381990 for EpicFurnaces v4.5.8 generated an exception
java.lang.NullPointerException: null
        at com.songoda.epicfurnaces.furnace.Furnace.getPerformanceTotal(Furnace.java:223) ~[?:?]
        at com.songoda.epicfurnaces.furnace.Furnace.lambda$updateCook$2(Furnace.java:192) ~[?:?]
        at org.bukkit.craftbukkit.v1_15_R1.scheduler.CraftTask.run(CraftTask.java:99) ~[patched_1.15.2.jar:git-Paper-355]
        at org.bukkit.craftbukkit.v1_15_R1.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:468) ~[patched_1.15.2.jar:git-Paper-355]
        at net.minecraft.server.v1_15_R1.MinecraftServer.b(MinecraftServer.java:1264) ~[patched_1.15.2.jar:git-Paper-355]
        at net.minecraft.server.v1_15_R1.DedicatedServer.b(DedicatedServer.java:431) ~[patched_1.15.2.jar:git-Paper-355]
        at net.minecraft.server.v1_15_R1.MinecraftServer.a(MinecraftServer.java:1181) ~[patched_1.15.2.jar:git-Paper-355]
        at net.minecraft.server.v1_15_R1.MinecraftServer.run(MinecraftServer.java:970) ~[patched_1.15.2.jar:git-Paper-355]
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_252]