Thread:Project:Support desk/Bad parser output text

After wiki upgrade my pages broke down. I get foolowing error while I am logged in:

[b32056b5] /index.php?title=Uchwa%C5%82y_zarz%C4%85du Exception from line 87 of /includes/parser/ParserOutput.php: Bad parser output text.

When I am not logged in the page works correctly. Could you please help me?