Mysql SELECT with common_schema function get_option returns NULL

Question

So I'm trying to order items in database by value which is sum of one row json encdoded value. For example few rows looks like:

id | program_invested_details | program_add_status | program_status 

5  | {"invested":"120.00","received":5.4}  | 4 | 1
7  | {"invested":"120.00","received":9}    | 4 | 1
15 | {"invested":"110.00","received":50}   | 4 | 1
52 | {"invested":"110.00","received":2}    | 4 | 1

and my query looks like:

SELECT id, ((`common_schema`.`get_option`("program_invested_details", "received") * 100) / `common_schema`.`get_option`("program_invested_details", "invested")) AS PERCENT_TOTAL FROM `hp_programs_list` WHERE `program_add_status` = 4 AND `program_status` = 1 ORDER BY PERCENT_TOTAL DESC

but after this query result is not the same as it should be:

    mysql> SELECT id, ((`common_schema`.`get_option`("program_invested_details", "received") * 100) / `common_schema`.`get_option`("program_invested_details", "invested")) AS PERCENT_TOTAL FROM `hp_programs_list` WHERE `program_add_status` = 4 AND `program_status` = 1 ORDER BY PERCENT_TOTAL DESC;
+-----+---------------+
| id  | PERCENT_TOTAL |
+-----+---------------+
| 314 | NULL          |
| 308 | NULL          |
| 307 | NULL          |
| 302 | NULL          |
| 287 | NULL          |
| 285 | NULL          |
| 280 | NULL          |
| 277 | NULL          |
| 269 | NULL          |
| 319 | NULL          |
| 317 | NULL          |
+-----+---------------+
11 rows in set (0.00 sec)

so the PERCENT_TOTAL is NULL instead of SUM. Where is the problem?

Answer 1

    mysql> SELECT `common_schema`.`get_option`(`program_invested_details`, 'received') `percent` FROM `admin_hyips_database`.`hp_programs_list` ORDER BY percent DESC LIMIT 10;
+---------+
| percent |
+---------+
| 93.50   |
| 92.13   |
| 91.47   |
| 9.90    |
| 9.19    |
| 9.14    |
| 9.13    |
| 9.02    |
| 9.00    |
| 9.00    |
+---------+

its working. Removed double quotes and added "`" on selector.