Fatal Error on Multisite

  • Hi, I have a multisite WordPress install with Post SMTP on site 1. When I tried to activate the plugin on site 2 or 3, the plugin triggered a fatal error. It also happens when I try to deactivate the plugin on site 1. Does anyone have a solution to this?

    Fatal error: Uncaught Error: Call to a member function add_cap() on null
    in /srv/www/osteroo.com/releases/20200722114203/web/app/plugins/post-smtp/Postman/PostmanInstaller.php on line 120

    Call stack:

    PostmanInstaller::addCapability()
    app/plugins/post-smtp/Postman/PostmanInstaller.php:64
    PostmanInstaller::activatePostman()
    app/plugins/post-smtp/Postman/Postman.php:129
    Postman::__construct()
    app/plugins/post-smtp/postman-smtp.php:133
    post_setupPostman()
    app/plugins/post-smtp/postman-smtp.php:124
    post_smtp_start()
    app/plugins/post-smtp/postman-smtp.php:57
    include()
    wp-admin/includes/plugin.php:2255
    plugin_sandbox_scrape()
    wp-admin/plugins.php:177

    The page I need help with: [log in to see the link]

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