Export to PDF - Cannot read property 'className' of null

i am using scheduler exportToPdf(offline) for exporting my schedule and it works fine.
But
when i am click on ExportToPdf button on grid view mode (i am using Grid in Scheduler). it showing
ERROR (in Console) : Cannot read property ‘className’ of null

Are you using online or offline export ?
In case of offline export is it PHP or .Net version ?

i am using Offline Export and .net version

Hi,
unfortunately the offline export is currently not supports exporting of a Grid view