NillaBlog and Rich format

Mayby someone help me solve my problem :)
I am using NillaBlog with Rich editor and when I tried to use <hr> to shorten my message I got error like this:
Is it posible to use NB with <hr> (Read More link) and Rich format? Or NB only works with Advanced Edіtor? @ddumont Will NB works fine with Rich editor in future?
P.S. NB v2.0.0, Vanilla v3.3
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