If user has bg=NONE or bg="" on any of the four groups...

[averms]

The Restore functions will throw an exception, and the ones after the one that throws an exception will not get executed.

lite-dfm/plugin/litedfm.vim

Lines 143 to 152 in 9420ab6

	try
	execute s:Restore('LineNr')
	execute s:Restore('CursorLineNR')
	execute s:Restore('NonText')
	execute s:Restore('FoldColumn')
	catch /.*/
	" Attempting to Restore values fails when they were never changed to begin
	" with. This is VimScript, so we don't care and just swallow the
	" exception.
	endtry