This an additional note to my previous question regarding limitations

When I was drilling down through the data, the application started to load rows and then just hung
There were about 19,000 to be loaded
When I checked the javascript console I found the following;
Uncaught TypeError: Cannot read property 'caption' of undefinedv6.kV @ pivot.min.js?2.207:1v6.getData @ pivot.min.js?2.207:1sheet.getDataFunction @ pivot.min.js?2.207:1z.getData @ pivot.min.js?2.207:1W6.getCell @ pivot.min.js?2.207:1T6.lf @ pivot.min.js?2.207:1W6.Ha @ pivot.min.js?2.207:1v6.Ha @ pivot.min.js?2.207:1O6.showGrid @ pivot.min.js?2.207:1O6.Ha @ pivot.min.js?2.207:1O6.en @ pivot.min.js?2.207:1f.dispatch @ pivot.min.js?2.207:1k6.nz @ pivot.min.js?2.207:1k6.YA @ pivot.min.js?2.207:1f.dispatch @ pivot.min.js?2.207:1k6.Po @ pivot.min.js?2.207:1D6.kf @ pivot.min.js?2.207:1f.dispatch @ pivot.min.js?2.207:1k6.Ci @ pivot.min.js?2.207:1(anonymous function) @ pivot.min.js?2.207:1O6.kf @ pivot.min.js?2.207:1(anonymous function) @ pivot.min.js?2.207:1M.qW @ pivot.min.js?2.207:1$.(anonymous function).success @ pivot.min.js?2.207:1j @ jquery.min.js:2k.fireWith @ jquery.min.js:2x @ jquery.min.js:4(anonymous function) @ jquery.min.js:4

Regards