crash after sound_stop

2019-06-26 11:15:29: WARNING[Server]: Undeclared global variable "handle" accessed at /home/paul/.minetest/mods/fireplace/init.lua:110
2019-06-26 11:15:39: ERROR[Main]: ServerError: AsyncErr: environment_Step: Runtime error from mod 'creative' in callback environment_Step(): /home/paul/.minetest/mods/fireplace/init.lua:109: bad argument #1 to 'sound_stop' (number expected, got nil)
2019-06-26 11:15:39: ERROR[Main]: stack traceback:
2019-06-26 11:15:39: ERROR[Main]: 	[C]: in function 'sound_stop'
2019-06-26 11:15:39: ERROR[Main]: 	/home/paul/.minetest/mods/fireplace/init.lua:109: in function 'func'
2019-06-26 11:15:39: ERROR[Main]: 	/usr/share/minetest/builtin/common/after.lua:18: in function </usr/share/minetest/builtin/common/after.lua:4>
2019-06-26 11:15:39: ERROR[Main]: 	/usr/share/minetest/builtin/game/register.lua:419: in function </usr/share/minetest/builtin/game/register.lua:399>
2019-06-26 11:15:39: ERROR[Main]: stack traceback:
2019-06-26 11:15:39: ACTION[Main]: Server: Shutting down
2019-06-26 11:15:45: ERROR[Main]: Please choose a name!