! Undefined control sequence.<recently read> \mathsemicolon \printbibliography[heading=bibintoc]

Hi,
I’m havin an issue with Bibliography.tex file that I can’t fix.
The following is the error message that I get:

! Undefined control sequence.
<recently read> \mathsemicolon
l.15 \printbibliography[heading=bibintoc]
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.

Thanks for the help.
Edoardo

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