I found a bug in monitor app which only exists when im accessing ISPConfig via Internet Explorer. Log-in to your ISPConfig 3 admin account via Internet Explorer Click "Monitor" tab Click any menu position below "Hardware Information", "Server State" or "Logfiles". Proof:
The monitor app is a android application, so you cant use it wite ie. Your screenshot shows the ispconfig monitor module and not the monitor app, the sql error indicates a problem with your installation and not a bug in ispconfig. Seems as if the ispconfig installation is incomplete as the server record is missing or the server has been deleted under System > Server services. I verified on several servers that the monitor works fine on a correctly installed ispconfig system.