Unhandled exceptions block page loads in Mullvad Browser sometimes

[PieroV]

Tested in Mullvad Browser alpha 13.5a5.

Sometimes the pages don't load as expected (they remain in about:blank), and I get these errors in the console:

JSON.parse: unexpected character at line 1 column 1 of the JSON data 95 [background-BGJ26hj7.js:1](moz-extension://.../dist/assets/background-BGJ26hj7.js)
    S moz-extension://.../dist/assets/background-BGJ26hj7.js:1
    AsyncFunctionNext self-hosted:852

And, probably as a result:

AbortError: Actor 'Conduits' destroyed before query 'RuntimeMessage' was resolved [ConduitsParent.sys.mjs:362](resource://gre/modules/ConduitsParent.sys.mjs)
    _raceResponses resource://gre/modules/ConduitsParent.sys.mjs:362

I'm not sure of the exact STR, but it happened to me several times.