Causes of CFDictionaryGetValue crash?

Question

I'm having random crashes within my swift app and they are all throwing a similar error around CFDictionaryGetValue

Here are two screenshots from my Google Crashlytics showing the error and that its effecting to different URLs, Note these are from two separate crashes

Then here is also a screenshot directly from within Xcode where I was able to reproduct the error:

There doesn't seem to be any specific action that causes this issue and it occurs at random times.

And advise for trying to trace it and debug would be much appreciated!

Thanks Oliver

Answer 1

As it turns out this issue was caused by a bug within the Firebase Performance SDK. After removing the SDK everything is working as expected

https://github.com/firebase/firebase-ios-sdk/issues/6734?fbclid=IwAR0L5U4dsBjyUGmklr8qEohlKTyY7P6zJwzWUnU3dUTnFmb0aclK4-rt5os

Answer 2

Try setting up an Exception breakpoint, it would probably give you more information to help you debug it:

In Xcode:

• Go to Breakpoint Navigator (CMD+8)
• Click the + button in the bottom left corner of the navigator and then choose Exception Breakpoint...
• Select All in the Exception field
• Re-run your app and you should get clearer information in the debugger