Can't display this list Cannot read property "sys_id" from null

[SreeranjaniS]

Hi All,
We have built a custom workspace in home page we have a dashboard where a Simple list is added
Using UI builder. Now from past few days we are getting this error "Can't display this list Cannot read property "sys_id" from null" 

[cvamsoni]

I think your data source is returning null if your simple list bound to a data source or like table query reasons may be query is invalid , filters are broken. it saying simply sys_id is not there

[Subhan67]

You can refer to this KB article
https://support.servicenow.com/kb?id=kb_article_view&sysparm_article=KB3000491 and use the attached XML to apply the fix.

Please mark my response as helpful if it works for you.