### Is there an existing issue for this? - [X] I have checked for existing issues https://github.com/getsentry/sentry-javascript/issues - [X] I have reviewed the documentation https://docs.sentry.io/ - [X] I am using the latest SDK release https://github.com/getsentry/sentry-javascript/releases ### How do you use Sentry? Sentry Saas (sentry.io) ### Which package are you using? @sentry/browser ### SDK Version 7.12.1 ### Framework Version react 17.0.2 ### Link to Sentry event https://sentry.io/organizations/jinshuju/issues/3610808007/?project=1360752 ### Steps to Reproduce <img width="2215" alt="image" src="https://user-images.githubusercontent.com/7360502/191692620-ba92c9d0-d29f-4969-9e1c-35c39d58f765.png"> I find source code: https://github.com/getsentry/sentry-javascript/blob/7.13.0/packages/browser/src/transports/fetch.ts <img width="1160" alt="image" src="https://user-images.githubusercontent.com/7360502/191693398-21edc0d6-d9b1-4e13-8dbf-e8a302ddee63.png"> ### Expected Result no error ### Actual Result <img width="2215" alt="image" src="https://user-images.githubusercontent.com/7360502/191692620-ba92c9d0-d29f-4969-9e1c-35c39d58f765.png">