Version 0.9.0 Crash

<img width="2032" alt="image" src="https://user-images.githubusercontent.com/85152160/155444192-316e1d11-d26e-4cd4-86a7-27d6098323ba.png">

Steps:
1. Integrated the SDK with Cocoapods
2. Does not call `DBDebugToolkit.setup()`
3. Run and then crash.

Version: 0.9.0
Xcode Version: 12.5.1
iOS Version: 15.2