[bug] nil value fp when using plugin last project

[quadroli]

An error occurs that shows up in the logs that fp is a nil value when using the lastproject.lua plugin, this has occured no matter whether if i open the progrom with an argument or not, here is a snippet:

i run Manjaro linux, 64 bit, kindly do review this, it would be such a handy feature to use, at the moment i have resulted to deleting the plugin entirely, sorry but i don't quite have sufficient knowledge in Lua nor C for that matter, kindly do resolve this, it would be such a handy feature to have, and also great text editor u've made here, i'm definitely looking forward to maining it ☺️, good work 👌