/cp/collections/products?site=default?site=default

[stephenmeehanuk]

Hi

I received an email notification from Laravel Nightwatch this morning, telling me about a 500 error when a logged in user visited this page /cp/collections/products?site=default?site=default

I've visited that URL (as the logged in user) and can't replicate the issue? Also, what could the user have clicked on to get to that URL in the first place?

Line 114 is 'site' => $site->handle(), so it's related to the site handle? But this is and always has been a single site, I've never activated multisite?

Here's the stacktrace:
stacktrace.txt