Question 1

What's the difference between 'On Error Resume Next' and 'On Error GoTo'?

Accepted Answer

'On Error Resume Next' ignores errors and continues to the next line – dangerous as errors go unnoticed. 'On Error GoTo Label' jumps to a defined error handler – better for controlled error handling with logging and cleanup logic.

Question 2

How do I implement a Try-Catch pattern in VBA?

Accepted Answer

VBA doesn't have native Try-Catch, but you can replicate it: 'On Error GoTo ErrorHandler' at the start, your code runs normally, on error it jumps to 'ErrorHandler:', handle the error there, then 'Exit Sub' before the handler so normal code doesn't fall into it.

Question 3

Should I always log errors?

Accepted Answer

Yes, especially in production! Without logging, you won't see what errors users encounter. At minimum, write Err.Number, Err.Description, and function name to a log sheet or text file.

Question 4

What are common mistakes in error handling?

Accepted Answer

1) 'On Error Resume Next' without later 'On Error GoTo 0' – all errors are permanently ignored. 2) No Exit Sub/Function before ErrorHandler – normal code runs into the handler. 3) No cleanup logic in error handler (open files, unreleased objects).

Question 5

How do I test error-handling code?

Accepted Answer

Force errors deliberately: 1) Invalid file paths, 2) Division by zero, 3) Access to non-existent sheets. Verify your error handler reacts correctly, logs, and cleans up.

Question 6

Can AI improve my error-handling code?

Accepted Answer

Absolutely! VBA AI analyzes your code, finds unhandled error sources, suggests structured error handlers, and adds logging automatically. Just paste your code and type 'Improve error handling'.

Question 7

What is the 'Err' object in VBA?

Accepted Answer

The global Err object stores info about the last error: Err.Number (error code), Err.Description (error message), Err.Source (source). Use Err.Clear to clear the error. Use Err.Raise to generate custom errors.

VBA Error Handling – Robust Macros Without Runtime Errors

Error Handling in VBA Explained

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Automatic Error Handling

Try-Catch Pattern in VBA

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Frequently Asked Questions

Further Resources

Error Handling in VBA: Making Your Macros Truly Robust

Common VBA Runtime Errors – Solutions for Error 9, 13, 91, 1004

Debugging in VBA: Quick Fixes When Your Macro Fails

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