Error when sorting column with null values - Active Report

[brianweb]

I have a list in an Active Report with sort arrows enabled.  When I try to sort a column that contains some null values, I get the following error:

Unable to get property 'localeCompare' of undefined or null reference mhtml:https:// . . .

Is this expected behavior?  I would think null values would drop to the bottom versus showing an error.

Thanks,

Brian