Cannot read property 'extend' of undefined': ContextHub

While adding ContextHub to AEM site could see below errors

• Uncaught TypeError: Cannot read property 'extend' of undefined'
• Uncaught TypeError: window.injectContextHubUI is not a function

Change ContextHub entry in head section from 

<sly data-sly-resource="${'contexthub' @ resourceType='granite/contexthub/components/contexthub'}"/>

to 

!--/* Include Context Hub */-->
<sly data-sly-call="${clientlib.js @ categories='granite.utils'}"/>
<sly data-sly-resource="${'contexthub' @ resourceType='granite/contexthub/components/contexthub'}"/>

Click here to check how to setup ContextHub in AEM.