Grouping widget triggers an error when switching to next page

[KarlBaumann]

In this example, when switching to next page, grouping does not work anymore and it triggers an error
widget-grouping.js:211 Uncaught TypeError: Cannot read property '6' of undefined

[TheSin-]

what browser, I'm not seeing the error at all.

[KarlBaumann]

Google Chrome Version 51.0.2704.103 m on Windows 7, 64bit

[TheSin-]

let me dust off chrome and give it a shot, stand by

[TheSin-]

Same version but on MacOS, but still no error at all. I'll wait for @Mottie to get up I guess since he has access to windows.

[Mottie]

Thanks for reporting this issue! I'll have the problem fixed in the master branch shortly (updated demo - using widget-grouping.js from the master branch).