Error executing lua ...site/pack/packer/start/statusline.lua/lua/statusline.lua:4 cter <C>

[fengwk]

Sometimes I get an error when I use <C-o> to go back to the previous buffer

Error detected while processing BufLeave Autocommands for "*":
E5108: Error executing lua ...site/pack/packer/start/statusline.lua/lua/statusline.lua:4
cter <C>
stack traceback:
        [C]: in function '__newindex'
        ...site/pack/packer/start/statusline.lua/lua/statusline.lua:49: in function 'inA
        [string ":lua"]:1: in main chunk