Version Incompatibility for a Number Extraction Formula?

[applehugger]

I have a formula that will extract the only the first consecutive string of numbers in an alphanumeric string. Here is what the data in the cells I am referencing looks like:
7 MPH (28.0%)

Here is the formula I am using to extract only the numbers before the MPH (in this case, 7):

=LEFT([@[OVER LIMIT]],MATCH(FALSE,ISNUMBER(--MID([@[OVER LIMIT]],ROW($1:$94),1)),0)-1)

In Excel 2019, this works perfectly. The problem is that I have Excel 2013 at work, and it just gives me a "#N/A" error. It doesn't make any sense to me because the LEFT, MATCH, and ISNUMBER all exist in Excel 2013. Does anyone have any idea why this may be failing to work in an older version of Excel? If it's any help, I incorporated this formula into a macro, which works perfectly in Excel 2019, but when I run it in Excel 2013, I get "Run-Time Error '438': Object doesn't support this property or method", and the line with the formula above is highlighted when debugging.

Any help is much appreciated!