Title: Uncaught Error
Last modified: January 2, 2026

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# Uncaught Error

 *  [matteo raggi](https://wordpress.org/support/users/whichtransfers/)
 * (@whichtransfers)
 * [5 months, 1 week ago](https://wordpress.org/support/topic/uncaught-error-55/)
 * After installing this plugin, in the plugin list I read an error showed from 
   the plugin “Query Monitor”:
 * Uncaught Error: count(): Argument #1 ($value) must be of type Countable|array,
   null given
   in **mydomainpath/public_html/wp-admin/includes/class-wp-list-table.
   php** on line **661**
 * Call stack:
    1. `WP_List_Table::row_actions(NULL, true)`
       wp-admin/includes/class-wp-plugins-
       list-table.php:1158
    2. `WP_Plugins_List_Table::single_row(array)`
       wp-admin/includes/class-wp-plugins-
       list-table.php:711
    3. `WP_Plugins_List_Table::display_rows()`
       wp-admin/includes/class-wp-list-table.
       php:1711
    4. `WP_List_Table::display_rows_or_placeholder()`
       wp-admin/includes/class-wp-list-
       table.php:1635
    5. `WP_List_Table::display()`
       wp-admin/plugins.php:814
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Funcaught-error-55%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

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 * 0 replies
 * 1 participant
 * Last reply from: [matteo raggi](https://wordpress.org/support/users/whichtransfers/)
 * Last activity: [5 months, 1 week ago](https://wordpress.org/support/topic/uncaught-error-55/)
 * Status: not resolved