Field 'paragraphs.paraimage' Cannot Be A Zero-length String

Access Database
Field required = no

for i = 0 to 2
arrParap(i) = MakeSafe(Request.Form("ppara_text"&cstr(i+1)),2400)
arrImgp(i) = MakeSafe(Request.Form("pimage"&cstr(i+1)),50)
arrImgpPos(i) = MakeSafe(Request.Form("pimgpos"&cstr(i+1)),50)
if len(arrParap(i)) > 0 then
strQp1 = "INSERT INTO paragraphs(para_page, paratext, paraimage, imgposition)"
strQp1 = strQp1 & "VALUES ('" & objRS1("Subcateg_id") & "', '" _
& arrParap(i) & "', '" _
& arrImgp(i) & "', '" _
& arrImgpPos(i) & "')"
objConn.Execute strQp1
End If

result

Microsoft OLE DB Provider for ODBC Drivers error '80004005'

[Microsoft][ODBC Microsoft Access Driver] Field 'paragraphs.paraimage' cannot be a zero-length string. /content-builder/admin/pageadd.asp, line 53