Type mismatch

I am getting an error of type mismatch error. Here is the code:-
If OracleFormWindow("Vendor Items").OracleTable("Vendor Items Table").GetFieldValue(x, "SKU #") = DbGetString(dbCon, "select distinct sku_no from vendor_item where sku_no = " & arrSkus(0, x-1))Then


Can enyone help me with this
Thanks