Solving "libc++abi.dylib: Uncaught nsexception Type & How to Overcome (lldb)" Issues

In this guide, we will explore how to troubleshoot and resolve issues related to libc++abi.dylib: terminating with uncaught exception of type NSException and (lldb) in Xcode projects. This documentation will provide valuable and relevant information for developers experiencing these issues, and it will offer step-by-step solutions for overcoming them.

Table of Contents

  1. Understanding libc++abi.dylib and (lldb) Issues
  2. Common Causes and Resolutions
  3. Step-by-Step Troubleshooting Guide
  4. FAQs
  5. Related Links

Understanding libc++abi.dylib and (lldb) Issues

The libc++abi.dylib error is a common exception in Xcode projects, indicating that the program has encountered an unexpected condition and is unable to continue running. This error often appears alongside the (lldb) issue, which refers to the Low-Level Debugger (LLDB) that is automatically triggered when an unhandled exception occurs in the program.

When encountering these issues, it is essential to identify the root cause and apply the necessary fixes to prevent future occurrences.

Common Causes and Resolutions

Here are some common causes of libc++abi.dylib and (lldb) issues and their respective resolutions:

Outdated or Incompatible Frameworks and Libraries: Ensure that you are using the latest version of all frameworks and libraries in your project. Update them if necessary.

Incorrect Configuration: Check your project's build settings, ensuring that all configurations are set correctly. Ensure that the Enable Exceptions and Enable Objective-C Exceptions settings are enabled.

Incorrect Code: Analyze your code for any syntax errors or logical issues that could be causing the exception. Look for common issues such as uninitialized variables, invalid object references, or improper memory management.

  1. Unhandled Exceptions: Implement proper exception handling in your code to catch and handle exceptions gracefully.

Step-by-Step Troubleshooting Guide

Follow these steps to troubleshoot and resolve libc++abi.dylib and (lldb) issues in your Xcode project:

Enable Exception Breakpoints: This will help you identify the exact line of code causing the issue. To enable exception breakpoints:

  • Open your project in Xcode.
  • Go to the Breakpoint Navigator (⌘+7).
  • Click the + button at the bottom-left corner of the navigator.
  • Select Exception Breakpoint.
  • Make sure that the Exception field is set to "All" and Break is set to "On Throw".
  • Click Done.

Reproduce the Issue: Run your project and reproduce the issue. When the exception breakpoint is hit, the debugger will pause execution at the problematic line of code.

Inspect the Stack Trace: Analyze the stack trace in the Debug Navigator (⌘+6) to identify the root cause of the issue.

Apply the Necessary Fixes: Depending on the root cause, apply the appropriate fix, such as updating frameworks or libraries, fixing code issues, or implementing proper exception handling.

Test the Fix: Run your project again to ensure that the issue has been resolved.


1. How can I identify the exact line of code causing the libc++abi.dylib and (lldb) issues?

By enabling exception breakpoints, the debugger will pause execution at the problematic line of code when the exception is thrown. This will help you identify the exact line causing the issue.

2. How do I update the frameworks and libraries in my project?

Updating frameworks and libraries can be done through the project's dependency manager (e.g., CocoaPods or Carthage) or by manually downloading and replacing the outdated files with the new versions.

3. How can I implement proper exception handling in my code?

Exception handling in Objective-C can be done using @try, @catch, and @finally blocks. In Swift, you can use the do, catch, and try keywords to handle exceptions.

4. How do I check if the Enable Exceptions and Enable Objective-C Exceptions settings are enabled in my project?

These settings can be found in your project's build settings. To access them:

  • Open your project in Xcode.
  • Go to the Project Navigator (⌘+1).
  • Select your project file.
  • Go to the Build Settings tab.
  • Search for "Enable Exceptions" and "Enable Objective-C Exceptions" in the search bar.

5. How can I learn more about the Low-Level Debugger (LLDB)?

You can refer to the official LLDB documentation and the Apple Developer documentation on debugging for more information on using LLDB.

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