"Can't find variable: setIOSParameters" with FileStack and iOS

Question

Our site uses FileStack and we get frequent frontend (JavaScript) errors reported via Sentry on Mobile Safari (lately iOS 16.2, but it's happened with all version).

Can't find variable: setIOSParameters

I cannot reproduce this with either the iOS Simulator or a physical device.

Are we doing something wrong, or is there a known fix?

Answer 1

We get those as well, which from a reverse look-up from the IPs showed us an AWS instance, which means it's probably coming from web crawlers. We have started to ignore them using the ignoreErrors option when setting up the Sentry SDK.

Our current list:

/apstagLOADED is not defined/i,
/__cmp is not defined/i,
/Cannot read properties of undefined (reading 'cmp')/i,
/Cannot read properties of undefined (reading 'outputCurrentConfiguration')/i,
/IMUID is not defined/i,
/jwDefaults is not defined/i,
/YT is not defined/i,
/dailymotion is not defined/i,
/moat_px is not defined/i,
/Cannot read properties of undefined (reading 'variables')/i,
/Cannot read properties of undefined (reading 'ns')/i,
/Cannot read properties of undefined (reading 'mvpConfig')/i,
/ezDenty is not defined/i,
/Can't find variable: setIOSParameters/i