Frankly, I do not understand your next steps well. Better start a new thread including all the code related and try to explain what you want to do and what you can do now.
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If the line mapView.addOverlay(circles as! MKOverlay) causes Unexpectedly found nil, then mapView is nil when findSzczyty(_:) is called.
The crash log is suggesting that the crash happened while processing string interpolation, not when forced unwrapping. What sort of value are you passing to storeDomain?