wallet-standard:app-ready is missing object

[saberistic]

Describe the bug
I have created following adapter repo
and created an extension here with it
while loading the extension, on wallet-standard:app-ready event it attempts to decunstruct a variable which is null so it throws this error:

content.js:2 Uncaught TypeError: Cannot destructure property 'register' of 'undefined' as it is undefined.
    at e (content.js:2:451609)
    at content.js:2:451866

https://github.com/Spiral-Safe/wallet-adapter/blob/main/src/register.ts#L21

To Reproduce
Steps to reproduce the behavior:

1. build wallet adapter
2. build extension
3. run a site with solana wallet adapter
4. See the extension attempt on registering and failing

Expected behavior
shows wallet as a detected wallet in the list

Screenshots

Desktop (please complete the following information):

• Browser [brave]
• Version [1.63.169]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]