Uncaught TypeError Cannot read property get_lookupValue of null SharePoint Online JSOM

This SharePoint jsom tutorial, we will discuss how to resolve the below error which comes in SharePoint Online JavaScript object model (jsom). The error comes as: Uncaught TypeError: Cannot read property ‘get_lookupValue’ of null.

Uncaught TypeError: Cannot read property get_lookupValue of null.
Uncaught TypeError: Cannot read property get_lookupValue of null.

The above error comes while trying to retrieve lookup value from people picker control using jsom in SharePoint Online. The error was coming in the below line.

var assignedby=oListItem.get_Item(AssignedBy).get_lookupValue();
SharePoint Online Uncaught TypeError: Cannot read property get_lookupValue of null.
Uncaught TypeError: Cannot read property get_lookupValue of null.

Uncaught TypeError Cannot read property get_lookupValue of null

We have checked that “AssignedBy” was coming null because we were not populating AssignedBy which is a people picker control.

When we assign a value to the people picker control the error did not come.

Read some SharePoint JSOM tutorials:

I hope this SharePoint tutorial will help us to fix error, Uncaught TypeError Cannot read property get_lookupValue of null in SharePoint Online.

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