title: iOS app exits after Google signin
body: <p>My app worked fine in development straight from the computer to the device. When using Testflight/other deployment services, I was able to sign into my Google account (required for the app's functionality).<br>
  However, in the production environment, the app closed once it returned from Google. When reopening it, I was already signed in, but it still closed within a second or two. I was able to move a switch before then, which indicates that the app wasn't frozen. The device console says <code>App exited voluntarily.</code></p>