If you have had SSL activated on your website and have had your URL (web address) changed to https instead of http and you also have Google Analytics setup, you will need to login to your Google Analytics account and change your URL in the property settings over to https
Firstly login to your analytics account here: https://analytics.google.com/ and click the Admin option
On the next page click the Property Settings
Now in the default URL drop down box change it to https and then click save at the bottom of the page