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.

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();

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:

• Display List items in HTML Table using JSOM in SharePoint Hosted App
• [Solved] Uncaught ReferenceError: web is not defined Error in SharePoint Online JSOM
• How to get SharePoint person or group field using javascript (jsom)
• Retrieve SharePoint list items programmatically using jsom, rest api and csom
• How to create a list using jsom (JavaScript object model) in SharePoint?
• Retrieve all users from all groups using jsom in SharePoint
• Display SharePoint List Items in Div using JSOM (javascript object model)
• Retrieve SharePoint List Items and display in Hyperlink using JavaScript Object Model (jsom)
• Insert item to SharePoint Online list using JavaScript Object Model (jsom)
• Uncaught TypeError: Cannot read property ‘get_current’ of undefined error in jsom SharePoint Online

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