Issue title: Error on https://acf.pbxww.com/index.php
 Issue body: # Error Info
Error name: Error
Error message: panicked at 'called `Option38d1:d2b4:3d06:83e8:96a5:8c2:893d:aba5unwrap()` on a `None` value', core/src/avm2/object.rs:305:48
Error stack:
```
Error: panicked at 'called `Option38d1:d2b4:3d06:83e8:96a5:8c2:893d:aba5unwrap()` on a `None` value', core/src/avm2/object.rs:305:48
    at c.wbg.__wbg_new_df6e6ab7a65c4c4d (chrome-extension://donbcfbmhbcapadipfkeojnmajbakjdc/dist/966.js:1:6962)
    at st38d1:d2b4:3d06:83e8:96a5:8c2:893d:aba5syn38d1:d2b4:3d06:83e8:96a5:8c2:893d:aba5on38d1:d2b4:3d06:83e8:96a5:8c2:893d:aba5On38d1:d2b4:3d06:83e8:96a5:8c2:893d:aba5call_on38d1:d2b4:3d06:83e8:96a5:8c2:893d:aba5{{closure}}38d1:d2b4:3d06:83e8:96a5:8c2:893d:aba5h4dcb78b97de78bcf (chrome-extension://donbcfbmhbcapadipfkeojnmajbakjdc/dist/b2fc0abe3dbbf4e736aa.wasm:wasm-function[1016]:0x2f3fd8)
    at st38d1:d2b4:3d06:83e8:96a5:8c2:893d:aba5syn38d1:d2b4:3d06:83e8:96a5:8c2:893d:aba5on38d1:d2b4:3d06:83e8:96a5:8c2:893d:aba5On38d1:d2b4:3d06:83e8:96a5:8c2:893d:aba5call_inner38d1:d2b4:3d06:83e8:96a5:8c2:893d:aba5h9279eef47cf85b81 (chrome-extension://donbcfbmhbcapadipfkeojnmajbakjdc/dist/b2fc0abe3dbbf4e736aa.wasm:wasm-function[1152]:0x3276ac)
    at cor38d1:d2b4:3d06:83e8:96a5:8c2:893d:aba5ops38d1:d2b4:3d06:83e8:96a5:8c2:893d:aba5unction38d1:d2b4:3d06:83e8:96a5:8c2:893d:aba5nOn38d1:d2b4:3d06:83e8:96a5:8c2:893d:aba5call_once{{vtable.shim}}38d1:d2b4:3d06:83e8:96a5:8c2:893d:aba5h7e6cf7c840665392 (chrome-extension://donbcfbmhbcapadipfkeojnmajbakjdc/dist/b2fc0abe3dbbf4e736aa.wasm:wasm-function[4725]:0x4d3db3)
    at st38d1:d2b4:3d06:83e8:96a5:8c2:893d:aba5panicking38d1:d2b4:3d06:83e8:96a5:8c2:893d:aba5rust_panic_with_hook38d1:d2b4:3d06:83e8:96a5:8c2:893d:aba5h47a0e203360b6c10 (chrome-extension://donbcfbmhbcapadipfkeojnmajbakjdc/dist/b2fc0abe3dbbf4e736aa.wasm:wasm-function[3192]:0x47f3dc)
    at cor38d1:d2b4:3d06:83e8:96a5:8c2:893d:aba5panicking38d1:d2b4:3d06:83e8:96a5:8c2:893d:aba5panic_fmt38d1:d2b4:3d06:83e8:96a5:8c2:893d:aba5h4ca53049f45e3264 (chrome-extension://donbcfbmhbcapadipfkeojnmajbakjdc/dist/b2fc0abe3dbbf4e736aa.wasm:wasm-function[4996]:0x4df9ff)
    at cor38d1:d2b4:3d06:83e8:96a5:8c2:893d:aba5panicking38d1:d2b4:3d06:83e8:96a5:8c2:893d:aba5pani38d1:d2b4:3d06:83e8:96a5:8c2:893d:aba5h35778e3c18266c93 (chrome-extension://donbcfbmhbcapadipfkeojnmajbakjdc/dist/b2fc0abe3dbbf4e736aa.wasm:wasm-function[4722]:0x4d38da)
    at <ruffle_cor38d1:d2b4:3d06:83e8:96a5:8c2:893d:aba5avm38d1:d2b4:3d06:83e8:96a5:8c2:893d:aba5object38d1:d2b4:3d06:83e8:96a5:8c2:893d:aba5Object as ruffle_cor38d1:d2b4:3d06:83e8:96a5:8c2:893d:aba5avm38d1:d2b4:3d06:83e8:96a5:8c2:893d:aba5object38d1:d2b4:3d06:83e8:96a5:8c2:893d:aba5TObject>38d1:d2b4:3d06:83e8:96a5:8c2:893d:aba5ll_property38d1:d2b4:3d06:83e8:96a5:8c2:893d:aba5h640a2e26c8018276 (chrome-extension://donbcfbmhbcapadipfkeojnmajbakjdc/dist/b2fc0abe3dbbf4e736aa.wasm:wasm-function[353]:0xd7eb5)
    at ruffle_cor38d1:d2b4:3d06:83e8:96a5:8c2:893d:aba5avm38d1:d2b4:3d06:83e8:96a5:8c2:893d:aba5activation38d1:d2b4:3d06:83e8:96a5:8c2:893d:aba5tivation38d1:d2b4:3d06:83e8:96a5:8c2:893d:aba5o_next_opco38d1:d2b4:3d06:83e8:96a5:8c2:893d:aba5hfeb3a14a7657719f (chrome-extension://donbcfbmhbcapadipfkeojnmajbakjdc/dist/b2fc0abe3dbbf4e736aa.wasm:wasm-function[312]:0x2daff)
    at ruffle_cor38d1:d2b4:3d06:83e8:96a5:8c2:893d:aba5avm38d1:d2b4:3d06:83e8:96a5:8c2:893d:aba5activation38d1:d2b4:3d06:83e8:96a5:8c2:893d:aba5tivation38d1:d2b4:3d06:83e8:96a5:8c2:893d:aba5run_actions38d1:d2b4:3d06:83e8:96a5:8c2:893d:aba5h6d51e9527e6f32fc (chrome-extension://donbcfbmhbcapadipfkeojnmajbakjdc/dist/b2fc0abe3dbbf4e736aa.wasm:wasm-function[2900]:0x4656f9)
```

# Player Info
Allows script access: true
Player type: Object
SWF URL: swf/pbxwwhd.4606.swf
Param movie: swf/pbxwwhd.4606.swf
Param scale: noScale
Param wmode: direct
Param allowFullScreenInteractive: true
Attribute 0: undefined
Attribute 1: undefined
Attribute 2: undefined
Attribute 3: undefined

# Page Info
Page URL: https://acf.pbxww.com/index.php?r=1643659604.8675
SWF URL: https://acf.pbxww.com/swf/pbxwwhd.4606.swf

# Browser Info
Useragent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/97.0.4692.99 Safari/537.36
OS: Win32

# Ruffle Info
Version: 0.1.0
Name: nightly 2022-01-31
Channel: nightly
Built: 2022-01-31T00:17:51.537Z
Commit: 83cc9dc30834acdf8bc03c9fe7392713a7e53792
Is extension: true

 Comments: 
 Comment 0: @Rob3487 Got another link or could you perhaps explain what this is?

The only thing I see there is ERROR 401 - SSO BUNDLE NOT SENT. For the developers to fix this error they'll need to be able to reproduce it themselves.
 Comment 1: Hi!

Unfortunately this is a logged area, one would have to create an account to
recreate the circumstance. I understand that this makes things
very difficult to solve the issue, I only reported it because the report
bug window popped up when it happened. That being said, flash reaching EOL
has caused significant disruption to the virtual PBX industry as possibly
the most popular small dollar solution was flash based (the one that this
bug relates to), possibly there would be some demand for your plugin if it
did solve the flash problem with this pbx software...?

I'll find a workaround for my needs - thank you for following up.

Regards,

Rob
Sent using EngageBay <https://eblink1.com/website>

On Tue, 1 Feb 2022 at 08:14, Poopooracoocoo ***@***.***>
wrote:

> @Rob3487 <https://github.com/Rob3487> Got another link or could you
> perhaps explain what this is?
>
> The only thing I see there is ERROR 401 - SSO BUNDLE NOT SENT. For the
> developers to fix this error they'll need to be able to reproduce it
> themselves.
>
> —
> Reply to this email directly, view it on GitHub
> <https://github.com/ruffle-rs/ruffle/issues/6181#issuecomment-1026265059>,
> or unsubscribe
> <https://github.com/notifications/unsubscribe-auth/AEVY65XMJC25QODQO66BV3DUY4CS5ANCNFSM5NHHX3FA>
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{'source': 'GithubIssues', 'repo_name_with_owner': 'ruffle-rs/ruffle', 'issue_id': 1119879714, 'repo_stars': 10984.0}