Broken Custom Macro Periodically

[mh z]

Hi,

I am writing a custom macro based on JSON-table macro to pull out the milestone table from JIRA. The custom one presets other fields of JSON-table and only needs to specifiy the id of milestone. But it breaks like once one or two weeks. The code doesn't change, just clicking "update", the macro will work again. Does anyone have any idea what is wrong here? Thanks in advance.