Error: [] operator not supported for strings in bootstrap5_add_table_variables() (line 202 of /var/www/drupal.10/html/themes/contrib/bootstrap5/bootstrap5.theme).

Happened to me here (with D 9.5.7 just installed) followed by a WSOD. The error above got logged, then the crash happened in the very same second, nothing got logged. Don't know if it's related, but hey, I thought I might let you know. Maybe 9.5.7 makes things more serious.

Confirmed! 👍
got the same while editing node revision.

Error: [] operator not supported for strings in bootstrap5_add_table_variables() (line 202 of themes/contrib/bootstrap5/bootstrap5.theme)

failed with:

Warning: Undefined array key "class" in _bootstrap5_attributes_class_string_to_array() (line 138 of themes/contrib/bootstrap5/bootstrap5.theme).
_bootstrap5_attributes_class_string_to_array(Array) (Line: 207)
bootstrap5_preprocess_image(Array, 'image', Array)
call_user_func_array('bootstrap5_preprocess_image', Array) (Line: 287)
Drupal\Core\Theme\ThemeManager->render('image', Array) (Line: 433)
Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 204)
Drupal\Core\Render\Renderer->render(Array) (Line: 479)
Drupal\Core\Template\TwigExtension->escapeFilter(Object, Array, 'html', NULL, 1) (Line: 39)
__TwigTemplate_0d4de798bef90c273e820025a1159b32->doDisplay(Array, Array) (Line: 405)
Twig\Template->displayWithErrorHandling(Array, Array) (Line: 378)
Twig\Template->display(Array) (Line: 390)
Twig\Template->render(Array) (Line: 55)

Try now.

tested and working

Committed! Thank you! 🥃

Automatically closed - issue fixed for 2 weeks with no activity.