Problems when insert into dbscript

I am getting a error when trying to insert null values into postgres table from web page where value could be null or a number. When all values are inputed the script works.
copy of error code and input string.
Error in query: INSERT INTO company VALUES (nextval('"company_company_id_seq"'::text),'company','address','box',1,3,1111,,,,,,, ,1111,,,') . ERROR: parser: parse error at or near ","
Any help would be appreciated
Louis