When creating an new invoice with free text item line I get this error You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ’ 0, 0, ‘0’, ‘0’, null, 0, 0, 1600, 2832, null, null, 0, 1, 0, ‘0’, 1600, 1232, 2’ at line 1
Enable the module debug bar.
Try your transaction again. After the SQL message, look in the debugbar at databases.
The item in your query right before this string ’ 0, 0, ‘0’, ‘0’, null, 0, 0, 1600, 2832, null, null, 0, 1, 0, ‘0’, 1600, 1232, 2’, you will find a sql query attribute that causes the problem, for instance a negative number. You can try the query in php admin for instance and change the attribute untill it works, then you have found the error and you can look for a solution.