Fatal error after activation

  • Hi!

    After plugin activation, there is a Fatal error

    Fatal error: Uncaught Error: Call to undefined function is_plugin_active() in plugins/edd-invoiced/includes/class-edd-invoiced-handler.php:399 Stack trace: #0 plugins/edd-invoiced/includes/class-edd-invoiced-handler.php(26):Edd_Invoiced_Handler->hooks() #1 plugins/edd-invoiced/includes/class-edd-invoiced-plugin.php(27): Edd_Invoiced_Handler::get_instance() #2 plugins/edd-invoiced/edd-invoiced-plugin.php(34): Edd_Invoiced_Plugin::get_instance() #3 plugins/edd-invoiced/edd-invoiced-plugin.php(63): EddInvoicePlugin() #4 wp-settings.php(362)….

    PHP 7.3
    WP 5.3

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