Count # Cells Until Next TRUE/1 Value is Found

[thisismyname2]

I am trying to find a formula that counts the # of cells until the next TRUE or "1" value is found. Please see "Target Output" in attachment. Blank cells can be any value. A simple MATCH function would seem to work in conjunction with OFFSET, but since there is a text header in A1 it always returns an error. Thanks in advance!

Count # cells until next true value.xlsx

[Aladin Akyurek]

In B2 enter and copy down:

=IF($A2=1,MATCH(1,A3:$A$38,0),"")

The last output which is #N/A looks to me more appropriate.