Unterminated string in JSON at position...

Hello, I'm sporatically getting the js console error 'Unterminated string in JSON at position'. But my input is the same. I deal with medical data, so sending raw data is tricky.
I'm using flexmonster/vue-flexmonster 2.9.31 
Check out this video of the problem. Below is the string for the output of 'this.qe' that I reference in the video:

..."mv_a_dur_pv_a_dur":null,"ESTSeg":null,"timezoneId":"America/Los_Angeles","case_delay_reason":null,"'

it just ends there, but according to the network call, the object is complete.
 
I'm calling flexmonster.setReport() with the following configuration.

{"dataSource":{"type":"json","filename":"https://app.encapturemd.com/api/rest/study/studyCache?from=2022-12-04&to=2022-12-07&dedAppVarNames=full_echo%2Cnuclear_cardiology_centric&timestamp=1670337743620&dateField=performed&flatten=true"},"slice":{"rows":[{"uniqueName":"app"},{"uniqueName":"examCodeDescription"}],"columns":[{"uniqueName":"[Measures]"},{"uniqueName":"Nuclear Tech Job"},{"uniqueName":"Technologist Job"}],"measures":[{"uniqueName":"id","aggregation":"distinctcount"}],"expands":{"rows":[{"tuple":["app.[echo]"]},{"tuple":["app.[nuclear cardiology v8]"]}],"columns":[{"tuple":["nuclear tech job.[]"]}]},"flatOrder":["LVEF","LVGeneral","id","app","examCodeDescription"]},"options":{"grid":{"showTotals":"off","showGrandTotals":"off"},"chart":{"activeMeasure":{"uniqueName":{}}},"datePattern":"yyyy-MM-dd","dateTimePattern":"yyyy-MM-dd hh:mm"},"tableSizes":{"columns":[{"tuple":["nuclear tech job.[hhuynh1]"],"measure":{"uniqueName":"id","aggregation":"distinctcount"},"width":142}],"rows":[{"tuple":["app.[echo]","examcodedescription.[]"],"height":31}]},"version":"2.9.31","creationDate":"2022-11-16T17:33:08.009Z"}