Google AdMob: weird bug + CPU usage

I want to tell you about a strange problem with the Google Ad Mob SDK in my iOS app. Sometimes, when a GADInterstitial is created, the following message is sent to the console (the application runs in debug mode):

void SendDelegateMessage (NSInvocation *): delegate (webView: decidePolicyForNavigationAction: request: frame: decisionListener :) failed to return after waiting 10 seconds. main launch mode: kCFRunLoopDefaultMode

I added a symbolic breakpoint on webView: decidePolicyForNavigationAction: request: frame: decisionListener:and found out that this error appears in Thread 1, queue: com.google.admob.sdk-core-controller .

Error messages are often executed using the central processor (65% - 75%). The user interface responds more slowly and more slowly until the application is killed.

iOS vesions: 7.1, 8 beta 4.

I should probably report this to the Google developers, but I will also leave it here.

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