[12:01:24 ERROR]: Error occurred while enabling CratesPlus v5.0-SNAPSHOT-7 (Is it up to date?)
java.lang.NumberFormatException: For input string: "null"
        at java.lang.NumberFormatException.forInputString(Unknown Source) ~[?:1.8.0_131]
        at java.lang.Integer.parseInt(Unknown Source) ~[?:1.8.0_131]
        at java.lang.Integer.valueOf(Unknown Source) ~[?:1.8.0_131]
        at plus.crates.Handlers.CrateHandler.<init>(CrateHandler.java:43) ~[?:?]
        at plus.crates.CratesPlus.onEnable(CratesPlus.java:131) ~[?:?]
        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:254) ~[patched_1.13.2.jar:git-Paper-566]
        at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:326) ~[patched_1.13.2.jar:git-Paper-566]
        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:406) ~[patched_1.13.2.jar:git-Paper-566]
        at org.bukkit.craftbukkit.v1_13_R2.CraftServer.enablePlugin(CraftServer.java:443) ~[patched_1.13.2.jar:git-Paper-566]
        at org.bukkit.craftbukkit.v1_13_R2.CraftServer.enablePlugins(CraftServer.java:357) ~[patched_1.13.2.jar:git-Paper-566]
        at net.minecraft.server.v1_13_R2.MinecraftServer.l(MinecraftServer.java:608) ~[patched_1.13.2.jar:git-Paper-566]
        at net.minecraft.server.v1_13_R2.MinecraftServer.a(MinecraftServer.java:570) ~[patched_1.13.2.jar:git-Paper-566]
        at net.minecraft.server.v1_13_R2.MinecraftServer.a(MinecraftServer.java:431) ~[patched_1.13.2.jar:git-Paper-566]
        at net.minecraft.server.v1_13_R2.DedicatedServer.init(DedicatedServer.java:316) ~[patched_1.13.2.jar:git-Paper-566]
        at net.minecraft.server.v1_13_R2.MinecraftServer.run(MinecraftServer.java:786) ~[patched_1.13.2.jar:git-Paper-566]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_131]