If you encounter this problem, you can fix it by using a NBT editor (e.g. NBTExplorer) and set your gamemode to peaceful (level.dat → Data → Difficulty → set to 0). However, it can happen again after setting your difficulty such that Drowneds will spawn.
Bart van der Braak
If you encounter this problem, you can fix it by using a NBT editor (e.g. NBTExplorer) and set your gamemode to peaceful (
level.dat → Data → Difficulty → set to 0). However, it can happen again after setting your difficulty such that Drowneds will spawn.