Weird Replace Problem

Im using this: 

Response.write Replace(rsJobsearch("jobdesc"),Chr(13) & Chr(10),"<br>")

I dont know why it quit working it was working great,  jobdesc is a memo in the access database.  Any ideas why I would get this error?  Thanks

Microsoft VBScript runtime error '800a005e'

Invalid use of Null: 'Replace'

maybe becose there is nothing IN "rsJobsearch("jobdesc")"

try

Dim strJobDesc
strJobDesc = rsJobsearch("jobdesc") & " "
strJobDesc = Replace(strJobDesc,vbCrlf,"<br>")

Response.Write(strJobDesc)

if that doesnt work try

if isNull(rsJobsearch("jobdesc") = True then
     Response.Write(Replace(rsJobsearch("jobdesc"),vbCrlf,"<br >"))
end if

basically you cant do a Replace() if there is nothing in the field (ie "JobDesc") so its giving an error

btw.. you can avoid the if..then by doing:

Response.Write Replace("" & rsJobsearch("jobdesc"),vbCrlf,"<br>")