Dynamic-array error handling

Dynamic-array error handling: what Excel is actually doing

Dynamic-array errors include blocked spills, incompatible array sizes, missing matches, and empty results. Diagnose the specific cause before applying IFERROR.

Read this Dynamic-array error handling example

Start with the business need: Keep a live report usable when no records meet its filters. Read each argument, reference, field, or control in the example before copying it into a larger model.

=IFERROR(FILTER(Data,Criteria),"No matching records")

Evidence that your Dynamic-array error handling result is trustworthy

Check for blocked spill ranges, mismatched array sizes, empty results, and unintended duplicates.

• Explain how the result supports this task: Keep a live report usable when no records meet its filters.
• Retain one known-result check and one boundary or exception check.
• Record the source, period, unit, and refresh assumption beside the output.

The Dynamic-array error handling mistake to catch

Wrapping a whole spill formula in IFERROR can hide a blocked range or structural design issue.

Your desk challenge for lesson 77

Create one blocked-spill example, repair it, and explain why clearing the obstruction is better than hiding the error.

• Define the complete source array and the shape of the required result.
• Keep the spill range clear.
• Test the formula after adding and removing source records.