If I try to group on a column with string values and one of the row values is null, jqgrid shows the “Loading” message indefinitely and the table stops working (cannot group on another column afterwards or remove grouping). If explicitly set the null values to “N/A”, it works and creates a group for “N/A”.

I am using local data in this scenario.

I would expect the behavior to be:

1. Throw exception with message “Cannot group on columns with null values”.

2. Or, alllow grouping on a column with null values by treating null as the empty string and allowing the user to specify template text to use for the group name when no string exists (i.e. otherGroupName: “Other” or otherGroupName: “N/A”).