Exception during HTML sanitization: java.lang.IndexOutOfBoundsException: Index: [..]

[ofi]

Recently we are experiencing blank HTML messages in web-ui from one of our partners. HTML looks fine, message also looks fine in other webmail/email client software. There is an exception in Mailbox.log saved while displaying the message:

soap - Exception during HTML sanitization: java.lang.IndexOutOfBoundsException: Index: 2, Size: 2

I`ve tried to pinpoint this error and it is the class name in HTML what is causing this crash.

I`ve attached two simple email messages. They differ with one character in class name. One of them is working fine, and the second one is causing exception.

Maybe somebody will take look at this bug.

Ubuntu 18.04, Zimbra community edition, 8.8.15.1583228261.p8-1.u1