mail_mod/ui/events.lua:71: attempt to index a nil value

[Bastrabun]

When a user clicks any of the column headers, the server crashes.

2023-04-14 21:54:06: ERROR[Main]: ServerError: AsyncErr: Lua: Runtime error from mod 'mail' in callback on_playerReceiveFields(): ...t/5.6.1/Minetest_test/bin/../mods/mail_mod/ui/events.lua:71: attempt to index a nil value
2023-04-14 21:54:06: ERROR[Main]: stack traceback:
2023-04-14 21:54:06: ERROR[Main]: 	...t/5.6.1/Minetest_test/bin/../mods/mail_mod/ui/events.lua:71: in function 'func'
2023-04-14 21:54:06: ERROR[Main]: 	...inetest_test/bin/../builtin/profiler/instrumentation.lua:107: in function <...inetest_test/bin/../builtin/profiler/instrumentation.lua:100>
2023-04-14 21:54:06: ERROR[Main]: 	.../mt/5.6.1/Minetest_test/bin/../builtin/game/register.lua:432: in function <.../mt/5.6.1/Minetest_test/bin/../builtin/game/register.lua:418>

2023-04-14 23:20:19: ERROR[Main]: ServerError: AsyncErr: Lua: Runtime error from mod 'mail' in callback on_playerReceiveFields(): ...t/5.6.1/Minetest_test/bin/../mods/mail_mod/ui/events.lua:71: attempt to index a nil value
2023-04-14 23:20:19: ERROR[Main]: stack traceback:
2023-04-14 23:20:19: ERROR[Main]: 	...t/5.6.1/Minetest_test/bin/../mods/mail_mod/ui/events.lua:71: in function 'func'
2023-04-14 23:20:19: ERROR[Main]: 	...inetest_test/bin/../builtin/profiler/instrumentation.lua:107: in function <...inetest_test/bin/../builtin/profiler/instrumentation.lua:100>
2023-04-14 23:20:19: ERROR[Main]: 	.../mt/5.6.1/Minetest_test/bin/../builtin/game/register.lua:432: in function <.../mt/5.6.1/Minetest_test/bin/../builtin/game/register.lua:418>

For my reference 4198

[Athozus]

Ok, trivial (doesn't check if it is an header or a message), going to fix this.

[S-S-X]

Clicking header could maybe set sorting and if same sort field is already selected then toggle sort direction.