SUMPRODUCT with text and number as data range

I have a table below

However, because this file is "link" to an external workbook by using a simple such as =[External WB]'Sheet1'!A1, there's some data that are actually not number, but text. I'd assume the creator uses "" as blank, instead of a numeric 0.

Given the SUMPRODUCT formula below, it return me a #VALUE! error.

My question now is that, what can I do on my SUMPRODUCT to convert all those #VALUE! to be a number, so that I can get the correct result.

Region	Product	Jan-18	... ...	Dec-18
North	A	10	... ...	20
South	A		... ...	5
North	B	8	... ...
North	C	7	... ...	#N/A

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Edit: Was able to solve using IF(NOT(ISERROR())) function within SUMPRODUCT array formula.

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Attach the workbook.

1. Make sure that your sample data are REPRESENTATIVE of your real data. The use of unrepresentative data is very frustrating and can lead to long delays in reaching a solution.

2. Make sure that your desired results are also shown (mock up the results manually).

3. Make sure that all confidential data is removed or replaced with dummy data first (e.g. names, addresses, E-mails, etc.).

4. Try to avoid using merged cells as they cause lots of problems.

Unfortunately the attachment icon doesn't work at the moment, so to attach an Excel file you have to do the following: just before posting, scroll down to Go Advanced and then scroll down to Manage Attachments. Now follow the instructions at the top of that screen.

Please pay particular attention to point 2 (above): without an idea of your intended outcomes, it is often very difficult to offer appropriate advice.

Thanks Bosco!

I was thinking of using SUMPRODUCT because I thought that the calculation will be faster.

Accept your answer and reps up to you.

Reps up to you too Jose!