When trying to test at which enchantment level you can instant mine stained hardened clay (in this case white). I accidentally gave myself a diamond pickaxe with an enchantment id that doesn't exist (command: /give @p diamond_pickaxe 1 0 {ench:[
{id:31,lvl:6}]}). I tried to open my inventory and it gave a NullPointerException and I was disconnected. This is the error code:
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[19:44:06] [Server thread/INFO]: stefvanschie lost connection: Internal Exception: io.netty.handler.codec.DecoderException: java.lang.NullPointerException