Warning Undefined array key “capabilities”

Getting this commentary from query monitor, it goes and returns with the same error when I turn it off and even uninstall and reinstall it. I get the impression this is an issue your side, but not tried it on other installations. Your other plugins are not reporting any issues, but it is something that I would prefer not there and will remove the plugin if it remains. But thought I’d raise it and see if you can fix it, or if I need to do something to get it fixed. Please let me know.

thanks

Warning	Undefined array key "capabilities"	2	
wp-includes/class-wp-roles.php:290
WP_Roles->init_roles()
wp-includes/class-wp-roles.php:330
WP_Roles->for_site()
wp-includes/class-wp-roles.php:90
WP_Roles->__construct()
wp-includes/capabilities.php:817
wp_roles()
wp-includes/class-wp-user.php:508
WP_User->get_role_caps()
wp-includes/class-wp-user.php:854
WP_User->for_site()
wp-includes/class-wp-user.php:176
WP_User->init()
wp-includes/pluggable.php:116
get_user_by()
wp-includes/pluggable.php:707
wp_validate_auth_cookie()
wp-includes/class-wp-hook.php:303
apply_filters('determine_current_user')
wp-includes/user.php:3193
_wp_get_current_user()
wp-includes/pluggable.php:70
wp_get_current_user()
wp-includes/l10n.php:97
get_user_locale()
wp-includes/l10n.php:140
determine_locale()
wp-includes/l10n.php:878
load_plugin_textdomain()
wp-content/plugins/shortpixel-image-optimiser/class/wp-short-pixel.php:39
WPShortPixel->__construct()
wp-content/plugins/shortpixel-image-optimiser/shortpixel-plugin.php:57
ShortPixel\ShortPixelPlugin->lowInit()
wp-includes/class-wp-hook.php:303
do_action('plugins_loaded')
wp-settings.php:441
Plugin: shortpixel-image-optimiser