[keycloak-user] Admin web site not working with Safari browser on OS X since 2.5.4

Not sure if it's a Safari bug or a Keycloak problem but since I updated to 2.5.4 I can't use Safari any more. The web site displays but it's as if there is a thread that refresh the page every 10 seconds making it unusable. This behaviour was observed on 2 computers. MacOS version 10.12.3 Safari 10.0.3