Crash with the Geyser luckyblock event

[AFCMS]

Describe the bug

AsyncErr: Lua: Runtime error from mod '' in callback node_on_receive_fields(): ...user/.minetest/mods/palamod/pala_luckyblock/events.lua:571: attempt to call field 'get_texture' (a nil value)
stack traceback:
	...user/.minetest/mods/palamod/pala_luckyblock/events.lua:571: in function 'func'
	...user/.minetest/mods/palamod/pala_luckyblock/init.lua:365: in function 'run_event'
	...user/.minetest/mods/palamod/pala_luckyblock/init.lua:467: in function <...user/.minetest/mods/palamod/pala_luckyblock/init.lua:451>

To Reproduce
Get the "Geyser" luckyblock event

Desktop (please complete the following information):

• OS: Ubuntu 22.04
• Minetest version: 5.6
• Palamod release/commit hash: master