I've experimented a little bit with a .md content file and managed to provocate an exception in the parser.

When I tried to strikethrough a text in the file and I wasn't sure anymore how to do it in markdown I wrote to equal-signs instead of tilde. I should point out that there was also a bracket in the text.

After I did that, the following error message was shown and I had to correct the wrong line with a file editor to fix it. "syntax error, unexpected '(' in Unknown on line 1 " on line 59 of /var/www/octobercms/modules/cms/classes/Section/Parser.php

I'm not writing the wrong line into this topic, because I'm afraid the same Parser might be used and I don't want to break the site :P