Production apps down (Uncaught runtime error)

Anvil Q&A
2

Same

The sites show:
This app has experienced an error
TypeError: can’t convert undefined to object

and

    [An internal error has occurred] - see browser console for more details
    Sk.abstr.setUpInheritance@https://anvil.works/runtime-new/runtime/js/lib/skulpt.min.js?sha=fdacbc81d97351cda9d4e0caa8685a6655f66ceeace702618aebfa22ada2578a:183:8
    Sk.abstr.buildNativeClass@https://anvil.works/runtime-new/runtime/js/lib/skulpt.min.js?sha=fdacbc81d97351cda9d4e0caa8685a6655f66ceeace702618aebfa22ada2578a:188:506
    @https://anvil.works/runtime-new/runtime/dist/runner.bundle.js?sha=edda38c18fed24a1bf3b58d56c045029ad5d469db37cd513eb8d43c7892ea5e5:666:343
    t@https://anvil.works/runtime-new/runtime/dist/runner.bundle.js?sha=edda38c18fed24a1bf3b58d56c045029ad5d469db37cd513eb8d43c7892ea5e5:1:110
    loadApp@https://anvil.works/runtime-new/runtime/dist/runner.bundle.js?sha=edda38c18fed24a1bf3b58d56c045029ad5d469db37cd513eb8d43c7892ea5e5:670:10263
    window.loadApp@https://anvil.works/runtime-new/runtime/dist/runner.bundle.js?sha=edda38c18fed24a1bf3b58d56c045029ad5d469db37cd513eb8d43c7892ea5e5:670:14588
    @https://4dqh5h5ekfr56loc.anvil.app/debug/2J4EXZDOXLKNWMAZ4LA67I44CN2Z5CMD%3DL3E4CKDO3Q7T5V26JP36AVK7/_/debug?requestTime=1665477266599:946:64552
    e@https://anvil.works/runtime-new/runtime/node_modules/jquery/dist/jquery.min.js?sha=f7f6a5894f1d19ddad6fa392b2ece2c5e578cbf7da4ea805b6885eb6985b6e3d:2:30005
    Deferred/then/l/</t<@https://anvil.works/runtime-new/runtime/node_modules/jquery/dist/jquery.min.js?sha=f7f6a5894f1d19ddad6fa392b2ece2c5e578cbf7da4ea805b6885eb6985b6e3d:2:30307