I got this error when trying to add a command:
20:48:44 [ERROR] Throwing
java.lang.NullPointerException: null
at idk.plugin.npc.NPC.onCommand(NPC.java:227) ~[?:?]
at cn.nukkit.command.PluginCommand.execute(PluginCommand.java:33) ~[nukkit.jar:?]
at...
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