Help needed with #REF! error (arrays)

Hi,
Need fresh eyes on this one.
For the life of me I cannot work out why I receive a #REF error with this array.
It's producing the right number of results for the arguments, but is displaying REF which does not make sense to me because values exist in the referenced cells.

using this formula:

IF(ROW()-94>COUNTIF($J$88:$J$91,$H$94),"",INDEX(H$87:H$91,SMALL(IF($J$88:$J$91=$H$94,ROW($J$88:$J$91),""),ROW()-94)))

Spreadsheet attached.
Thanks in advance.
Cam