If this happens, please upgrade the Patchstack plugin to at least version 2.0.2.
If you are unable to access your site due to this error, follow these steps:
Download the latest plugin version. You can usually find the latest version on the portal > click on your site > scroll down and click on the "Download Plugin" tab.
Login into (S)FTP of your site.
Browse to the /wp-content/plugins/webarx/ folder.
Copy the contents of the Patchstack folder in the .zip file you downloaded into the folder described in step 3.