---
title: NSUncaughtSystemExceptionException
framework: Exception Handling
role: symbol
role_heading: Global Variable
platforms: [Mac Catalyst 13.0+, macOS 10.0+]
path: exceptionhandling/nsuncaughtsystemexceptionexception
---

# NSUncaughtSystemExceptionException

Identifies an uncaught system exception.

## Declaration

```swift
let NSUncaughtSystemExceptionException: String
```

## See Also

### Constants

- [NSStackTraceKey](exceptionhandling/nsstacktracekey.md)
- [NSUncaughtRuntimeErrorException](exceptionhandling/nsuncaughtruntimeerrorexception.md)