Not all cells are going to be populated, and ones that don't will be undef, as you are seeing, not a cell object. Try it on a specific cell that you know has content. Or better yet, one you know is merged and one you know has content but is not merged.

In reply to Re^3: Spreadsheet::ParseXLSX question on merged cells by ysth
in thread Spreadsheet::ParseXLSX question on merged cells by chafelix

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