IcingaWeb2 and Graphite Error

I am running icinga2 and graphite on same machine.
Graphite is deployed as docker container.
I am getting errors for the graphs, you can see below:

Syntax error: ' <!DOCTYPE html> <html lang="de"> <head> <meta charset="utf-8"> <meta content="width=300, initial-scale=1" name="viewport"> <meta name="google-site-verification" content="LrdTUW9psUAMbh4Ia074-BPEVmcpBxF6Gwf0MSgQXZs"> <title>Anmelden – Google Konten</title> <style> @font-face { font-family: \'Open Sans\'; font-style: normal; font-weight: 300; src: local(\'Open Sans Light\'), local(\'OpenSans-Light\'), url(//fonts.gstatic.com/s/opensans/v15/mem5YaGs126MiZpBA-UN_r8OUuhs.ttf) format(\'truetype\'); } @font-face { font-family: \'Open Sans\'; font-style: normal; font-weight: 400; src: local(\'Open Sans\'), local(\'OpenSans\'), url(//fonts.gstatic.com/s/opensans/v15/mem8YaGs126MiZpBA-UFVZ0e.ttf) format(\'truetype\'); } </style> <style> h1, h2 { -webkit-animation-duration: 0.1s; -webkit-animation-name: fontfix; -webkit-animation-iteration-count: 1; -webkit-animation-timing-function: linear; -webkit-animation-delay: 0; } @-webkit-keyframes fontfix { from { opacity: 1; } to { opacity: 1; } } </style> <style> html, body { font-family: Arial, sans-serif; background: #fff; margin: 0; padding: 0; border: 0; position: absolute; height: 100%; min-width: 100%; font-size: 13px; color: #404040; direction: ltr; -webkit-text-size-adjust: none; } button, input[type=button], input[type=submit] { font-family: Arial, sans-serif; font-size: 13px; } a, a:hover, a:visited { color: #427fed; cursor: pointer; text-decoration: none; } a:hover { text-decoration: underline; } h1 { font-size: 20px; color: #262626; margin: 0 0 15px; font-weight: normal; } h2 { font-size: 14px; color: #262626; margin: 0 0 15px; font-weight: bold; } input[type=email], input[type=number], input[type=password], input[type=tel], input[type=text],

This is a part of the error that are displayed in icingaweb2.
Version being used:
IcingaWeb2: 2.8.0-rc1

Any feedback on why this error happens?