XF 2.1 Quote error from a particular user


Hello guys,

On my forum (recently imported from Vbulletin), every quoted message from a particular user gives an error. The error says that it is impossible to perform the action. Do you know what it can depend on? The user in this question has a nick with an "accented" character (Canà). My forum is Italian language. Could the error be caused by this? And how to solve?
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