Uncaught (in promise) TypeError: e.split is not a function

[pdehaan]

Steps to reproduce

1. Go to https://coverage.moz.tools/#view=zero
2. Click (disable) the "Show third-party files" checkbox.
3. Open devtools console.

Actual results

Page doesn't render and errors in console:

Uncaught (in promise) TypeError: e.split is not a function
    t https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    c https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    _invoke https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    m https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    ot https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    a https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    promise callback*ot https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    a https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    at https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    at https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    t https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    c https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    _invoke https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    m https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    ot https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    a https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    at https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    at https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    Ft https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    t https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    c https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    _invoke https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    m https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    G https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    a https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    U https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    U https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    Q https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    t https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    c https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    _invoke https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    m https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    Jt https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    a https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    promise callback*Jt https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    a https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    Kt https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    Kt https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    le https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    t https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    c https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    _invoke https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    m https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    ot https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    a https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    promise callback*ot https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    a https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    at https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    at https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    i https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    t https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    c https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    _invoke https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    m https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    ot https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    a https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    promise callback*ot https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    a https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    promise callback*ot https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    a https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    promise callback*ot https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    a https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    at https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    at https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    ct https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    <anonymous> https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    <anonymous> https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    <anonymous> https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    <anonymous> https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
[coverage-25eab803aef85d165cbc.js:14:41608](https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js)
    ot https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    s https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    (Async: promise callback)
    ot https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    a https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    (Async: promise callback)
    ot https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    a https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    at https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    at https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    i https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    (Async: EventHandlerNonNull)
    t https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    c https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    _invoke https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    m https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    ot https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    a https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    (Async: promise callback)
    ot https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    a https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    (Async: promise callback)
    ot https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    a https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    (Async: promise callback)
    ot https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    a https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    at https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    at https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    ct https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    <anonymous> https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    <anonymous> https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    <anonymous> https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14
    <anonymous> https://coverage.moz.tools/coverage-25eab803aef85d165cbc.js:14