"Non-Error promise rejection captured with value:"

This is most likely happening due to the safe links being scanned by Outlook

If you have an Office 365 subscription and your emails contain links to your site and these links use Safe Links feature then it is bound to happen

We were able to reproduce this and get the error in Sentry

For details see this thread https://forum.sentry.io/t/unhandledrejection-non-error-promise-rejection-captured-with-value/14062

This started happening to us on April 16th, on a day where we didn’t change any code at all. Since them we’ve had 98k of these errors. We’ve added some code to filter this out in our js as we can’t figure out a way to silence these at all. I’m guessing it’s related to some password manager like lastpass as it only happens on our login page, with chrome, on windows 10. We’ve added code like:

            beforeSend: function(event, hint) {
                // filter out UnhandledRejection errors that have no information
                if (event !== undefined && event.exception !== undefined && event.exception.values !== undefined
                    && event.exception.values.length == 1) {
                    var e = event.exception.values[0];
                    if (e.type === 'UnhandledRejection' && e.value === 'Non-Error promise rejection captured with value: ') {
                        return null;
                    }
                }
           }

If there’s a better way to deal with this, I’d love to know about it. On one hand, I can see how you don’t want to editorialize here and prevent these errors, but when there’s no info at all there’s nothing actionable and we can’t do anything about it other than be annoyed.