[DevExpress Support Team: CLONED FROM T706780: DataGrid - Filter Panel's custom filter failed]
Demo: https://js.devexpress.com/Demos/WidgetsGallery/Demo/DataGrid/FilterPanel/jQuery/Light/
Please check the attached screencast and the screenshot illustrating how to reproduce the issue from scratch.
DataGrid - The "Cannot read property 'split' of undefined" error occurs if one negative condition is specified in another condition
Answers approved by DevExpress Support
We have fixed the issue described in this ticket and will include the fix in our next maintenance update. To apply this solution before the official update, request a hotfix by clicking the corresponding link for product versions you require.
Note: Hotfixes may be unavailable for beta versions and updates that are about to be released.