Walker_Nav_Menu start_lvl end_lvl function signature question

I’m getting the dreaded diagnostic…

select_menu_walker::start_lvl() should be compatible with Walker_Nav_Menu::start_lvl(&$output, $depth = 0, $args = Array)

from a theme I’ve installed.

In functions.php the declaration does appear to be wrong…

class select_menu_walker extends Walker_Nav_Menu {

function start_lvl(&$output, $depth) {
$indent = str_repeat(“\t”, $depth);
$output .= “”;
}

However, if I add ‘, $args = array()’ as the 3rd argument this diagnostic continues.

Same is occurring with end_lvl() + start_el() + end_el().

No changes I make to to the function declarations seem to make any difference.

Suggestions?