It is by design how Analytics.Enabled setting works so you can turn it on/off entire functionality of Sitecore DMS.
So if you do not need to gather analytics data in CA environment turn it off for your front-end web site.
You can do this in web.config file via enableAnalytics attribute in a sitу section.
<site name="website" virtualFolder="/" physicalFolder="/" rootPath="/sitecore/content" startItem="/home" database="web" . . . enableAnalytics="false" />
Also, please pay attention to the Analytics.PerformLookup setting. It must be turn on only in ONE environment. For example, set it to True value in CA environment and set it to False value in the CD environment.