Thread 1: signal SIGTERM error

Hi all! I am getting this error while trying to run a calculator code on last Xcode 13.0. Did not have that problem in previous versions. App runs well until I close the Simulator and the error gets triggered. this is what is shown on left panel. Thread 3 Queue : com.apple.UIKit.KeyboardManagement (serial).

This is what I am getting at the debugger:

dyld4 config: DYLD_ROOT_PATH=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot DYLD_LIBRARY_PATH=/Users/osuhe/Library/Developer/Xcode/DerivedData/Calculator_Layout_iOS13-cdskmxpuiszizdgxwiezanhkuedj/Build/Products/Debug-iphonesimulator:/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/system/introspection DYLD_INSERT_LIBRARIES=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/libBacktraceRecording.dylib:/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/libMainThreadChecker.dylib:/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/Developer/Library/PrivateFrameworks/DTDDISupport.framework/libViewDebuggerSupport.dylib DYLD_FRAMEWORK_PATH=/Users/osuhe/Library/Developer/Xcode/DerivedData/Calculator_Layout_iOS13-cdskmxpuiszizdgxwiezanhkuedj/Build/Products/Debug-iphonesimulator

CoreSimulator 776.3 - Device: iPhone 8 Plus (53744E1C-0ED4-4759-9FFA-1B0D0DFEF30C) - Runtime: iOS 15.0 (19A339) - DeviceType: iPhone 8 Plus

(lldb)