mysql 5.0.67

Hi

I'm using version 5.0.67 and have a strange problem. I have a text field
and have a query which returned 193 characters (with spaces). In the mySQL
query browser I can see the field content fine.

However on my classic ASP page, I get nothing when I reponse the data to the
screen. Infact if I try to perform a replace function on the field data I
get

Microsoft VBScript runtime error '800a005e'

Invalid use of Null: 'replace'

Any ideas what the problem might be ?
Cheers
Neil