frequent crashes caused by administration mod

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The game crashes frequently in creative mode with the following error:

WARNING[Server]: Undeclared global variable "hbhunger" accessed at .../mods/administration/linus_added/functions.lua:78
ERROR[Main]: ServerError: AsyncErr: environment_Step: Runtime error from mod 'linus_added' in callback environment_Step(): .../mods/administration/linus_added/functions.lua:78: attempt to index global 'hbhunger' (a nil value)
ERROR[Main]: stack traceback:
ERROR[Main]: 	.../mods/administration/linus_added/functions.lua:78: in function <...mods/administration/linus_added/functions.lua:70>
ERROR[Main]: 	/usr/share/minetest/builtin/game/register.lua:420: in function </usr/share/minetest/builtin/game/register.lua:400>
ERROR[Main]: stack traceback: