Error Handling in wp-includes/widgets.php

[samchameleon]

When I tried to access Appearance -> widgets I encountered a critical error, the error was because when trying to merge arrays, there must have been a null value being passed to the merge array function.

$shown_widgets = array_merge( ...array_values( $sidebars_widgets ) );

So that I could temporarily access the page, I changed it to this:

$shown_widgets = array_merge( ...array_filter( array_values( $sidebars_widgets ), 'is_array' ) );

So that I could see if there was a broken widget.

[rollybueno]

Looks like a duplicate of https://core.trac.wordpress.org/ticket/57469

[SirLouen]

Duplicate of #57469.

Yes, its a duplicate.