Warning in template about Walker declaration

[woerdesign]

I get the following warning:
Warning: Declaration of DH_Mega_Walker::walk($elements, $max_depth) should be compatible with Walker::walk($elements, $max_depth, …$args) in /home/sites/site46240/web/wp-content/themes/woow/includes/walker.php on line 272

How to fix?

 

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