Fatal error – Wordpress Multisite

Hello,
We encountered a Fatal error with Rank Math installed on WordPress Multisite.

The error is as follows:

[14-Jan-2024 19:28:14 UTC] PHP Fatal error: Uncaught TypeError: Cannot access offset of type string on string in /dom45317/wp-content/plugins/seo-by-rank-math/includes/opengraph/class-image.php:522
Stack trace:
#0 /dom45317/wp-content/plugins/seo-by-rank-math/includes/opengraph/class-image.php(497): RankMath\OpenGraph\Image->set_content_image(Object(WP_Post))
#1 /dom45317/wp-content/plugins/seo-by-rank-math/includes/opengraph/class-image.php(321): RankMath\OpenGraph\Image->set_singular_image()
#2 /dom45317/wp-content/plugins/seo-by-rank-math/includes/opengraph/class-image.php(81): RankMath\OpenGraph\Image->set_images()
#3 /dom45317/wp-content/plugins/seo-by-rank-math/includes/opengraph/class-facebook.php(266): RankMath\OpenGraph\Image->__construct(Object(RankMath\OpenGraph\Facebook), Object(RankMath\OpenGraph\Facebook))
#4 /wordpress-versions/6.4.2/wp-includes/class-wp-hook.php(324): RankMath\OpenGraph\Facebook->image(Object(RankMath\OpenGraph\Facebook))
#5 /wordpress-versions/6.4.2/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array)
#6 /wordpress-versions/6.4.2/wp-includes/plugin.php(565): WP_Hook->do_action(Array)
#7 /dom45317/wp-content/plugins/seo-by-rank-math/includes/traits/class-hooker.php(88): do_action_ref_array(‘rank_math/openg…’, Array)
#8 /dom45317/wp-content/plugins/seo-by-rank-math/includes/opengraph/class-opengraph.php(74): RankMath\OpenGraph\OpenGraph->do_action(‘opengraph/faceb…’, Object(RankMath\OpenGraph\Facebook))
#9 /wordpress-versions/6.4.2/wp-includes/class-wp-hook.php(324): RankMath\OpenGraph\OpenGraph->output_tags()
#10 /wordpress-versions/6.4.2/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array)
#11 /wordpress-versions/6.4.2/wp-includes/plugin.php(565): WP_Hook->do_action(Array)
#12 /dom45317/wp-content/plugins/seo-by-rank-math/includes/traits/class-hooker.php(88): do_action_ref_array(‘rank_math/head’, Array)
#13 /dom45317/wp-content/plugins/seo-by-rank-math/includes/frontend/class-head.php(172): RankMath\Frontend\Head->do_action(‘head’)
#14 /wordpress-versions/6.4.2/wp-includes/class-wp-hook.php(324): RankMath\Frontend\Head->head(”)
#15 /wordpress-versions/6.4.2/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array)
#16 /wordpress-versions/6.4.2/wp-includes/plugin.php(517): WP_Hook->do_action(Array)
#17 /wordpress-versions/6.4.2/wp-includes/general-template.php(3052): do_action(‘wp_head’)
#18 /wordpress-versions/6.4.2/wp-includes/template-canvas.php(17): wp_head()
#19 /wordpress-versions/6.4.2/wp-includes/template-loader.php(106): include(‘/wordpress-vers…’)
#20 /wordpress-versions/6.4.2/wp-blog-header.php(19): require_once(‘/wordpress-vers…’)
#21 /wordpress-versions/6.4.2/index.php(17): require(‘/wordpress-vers…’)
#22 {main}
 thrown in /dom45317/wp-content/plugins/seo-by-rank-math/includes/opengraph/class-image.php on line 522

—–

The error only occurs on some pages. Not all.

We were able to add the filter below in our theme, which disabled the functionality which was causing the error, but we’re hoping to determine the cause, since the functionality disabled pertains to OpenGraph, and possibly we don’t wish this functionality disabled long term.

Thank you!

add_filter( ‘rank_math/opengraph/content_image_cache’, function( $ret ) {
return false;
}, PHP_INT_MAX );