errors when switching windows

[alex-tee]

the plugin works but when I go to the window below the css file I get these errors

Error detected while processing WinEnter Autocommands for "*"..function vim_sass_colors#run:
line   11:
E688: More targets than List items
Press ENTER or type command to continue
Error detected while processing WinEnter Autocommands for "*"..function vim_sass_colors#run:
line   12:
E121: Undefined variable: l:guibg
Press ENTER or type command to continue
Error detected while processing WinEnter Autocommands for "*"..function vim_sass_colors#run:
line   14:
E121: Undefined variable: l:group
Press ENTER or type command to continue
Error detected while processing WinEnter Autocommands for "*"..function vim_sass_colors#run:
line   14:
E116: Invalid arguments for function hlexists(l:group) == 0
Press ENTER or type command to continue
Error detected while processing WinEnter Autocommands for "*"..function vim_sass_colors#run:
line   23:
E121: Undefined variable: l:tdx
Press ENTER or type command to continue
Error detected while processing WinEnter Autocommands for "*"..function vim_sass_colors#run:
line   28:
E121: Undefined variable: l:cssname
Press ENTER or type command to continue
Error detected while processing WinEnter Autocommands for "*"..function vim_sass_colors#run:
line   33:
E121: Undefined variable: l:hsl
Press ENTER or type command to continue

[Lakshamana]

Running this plugin on Neovim version image below

gives me similar error, while switching windows: