2021-04-23 17:49:36: ACTION[Server]: singleplayer places node unknown:unknown at (6,1,-4)

[...] Remove mod for unknown:unknown to create unknown block, then restart minetest

2021-04-23 17:51:34: ACTION[Server]: singleplayer places node mcl_tnt:tnt at (6,2,-4)
2021-04-23 17:51:40: ERROR[Main]: ServerError: AsyncErr: ServerThread::run Lua: Runtime error from mod '??' in callback luaentity_Step(): ...etest/games/Mineclonia/mods/CORE/mcl_explosions/init.lua:206: attempt to compare nil with number
2021-04-23 17:51:40: ERROR[Main]: stack traceback:
2021-04-23 17:51:40: ERROR[Main]: 	...etest/games/Mineclonia/mods/CORE/mcl_explosions/init.lua:206: in function 'trace_explode'
2021-04-23 17:51:40: ERROR[Main]: 	...etest/games/Mineclonia/mods/CORE/mcl_explosions/init.lua:458: in function 'explode'
2021-04-23 17:51:40: ERROR[Main]: 	...o/.minetest/games/Mineclonia/mods/ITEMS/mcl_tnt/init.lua:183: in function 'on_step_old'
2021-04-23 17:51:40: ERROR[Main]: 	...mes/Mineclonia/mods/ENVIRONMENT/mcl_void_damage/init.lua:17: in function <...mes/Mineclonia/mods/ENVIRONMENT/mcl_void_damage/init.lua:16>
2021-04-23 17:51:40: ACTION[Server]: [doc] Wrote player data into /home/n_to/.minetest/worlds/xplosion/doc.mt.
2021-04-23 17:51:40: ACTION[Server]: singleplayer leaves game. List of players: 
2021-04-23 17:51:40: ACTION[Main]: Server: Shutting down
2021-04-23 17:51:40: ACTION[Main]: [doc] Server shuts down. Player data is about to be saved.
2021-04-23 17:51:40: ACTION[Main]: [doc] Wrote player data into /home/n_to/.minetest/worlds/xplosion/doc.mt.