Upgrade to v2.3 breaks site – admin bar and widgets disappear

Hi, If you are using old version of WP. Please upgrade to latest version.

What do you mean by “old”? I’m using WordPress 5.1.1, which, I believe, is the latest version. Also PHP v7.3.4

Now WordPress 5.2.
Discovered the source of the Fatal Error was another plugin.
However, the theme update appeared to have reset all the sidebar widgets. As I have several sidebars this is rather annoying. Fortunately, I could restore them from a backup.

Thanks for your “help”.

Scratch that. After further investigation it is indeed the theme update.

#5 /var/www/vhosts/hastingsflyfishe in /var/www/vhosts/hastingsflyfishers.org.au/httpdocs/wp-content/themes/canary/inc/filters.php on line 109

Fatal error: Uncaught ArgumentCountError: Too few arguments to function {closure}(), 1 passed in /var/www/vhosts/hastingsflyfishers.org.au/httpdocs/wp-includes/class-wp-hook.php on line 286 and exactly 3 expected in /var/www/vhosts/hastingsflyfishers.org.au/httpdocs/wp-content/themes/canary/inc/filters.php:109 Stack trace: #0 /var/www/vhosts/hastingsflyfishers.org.au/httpdocs/wp-includes/class-wp-hook.php(286): {closure}('Pic of the Mont...') #1 /var/www/vhosts/hastingsflyfishers.org.au/httpdocs/wp-includes/plugin.php(208): WP_Hook->apply_filters('Pic of the Mont...', Array) #2 /var/www/vhosts/hastingsflyfishers.org.au/httpdocs/wp-content/plugins/image-widget/image-widget.php(116): apply_filters('widget_title', 'Pic of the Mont...') #3 /var/www/vhosts/hastingsflyfishers.org.au/httpdocs/wp-includes/class-wp-widget.php(378): Tribe_Image_Widget->widget(Array, Array) #4 /var/www/vhosts/hastingsflyfishers.org.au/httpdocs/wp-includes/widgets.php(770): WP_Widget->display_callback(Array, Array) #5 /var/www/vhosts/hastingsflyfishe in /var/www/vhosts/hastingsflyfishers.org.au/httpdocs/wp-content/themes/canary/inc/filters.php on line 109

• This reply was modified 5 years, 6 months ago by funex.
• This reply was modified 5 years, 6 months ago by funex.

It seems that this fuction doesn’t sit well with the Simple Calendar plugin:

// add the filter for search widget title ....
add_filter( 'widget_title', function( $instance_title,$instance,$this_id_base ) { 
    if($this_id_base=='search'){
    	$instance_title = ! empty( $instance['title'] ) ? $instance['title'] :__('Search','canary');
    }  
    return $instance_title; 
} ); 

Remove it and the site appears to work as normal. Deactivating the plugin also “fixes” the problem. However, I’m reluctant to drop the plugin because it does exactly what I want it to do and I’d hate to have to change the theme after all the work I’ve put into the child theme.