Message filters cannot be applied unconditionally; their presence needs to be checked first.
<rdar://75314821>
Created attachment 422939 [details] Patch
Comment on attachment 422939 [details] Patch r=me
Comment on attachment 422939 [details] Patch Thanks for reviewing!
Committed r274289: <https://commits.webkit.org/r274289> All reviewed patches have been landed. Closing bug and clearing flags on attachment 422939 [details].