Adding the syntax package causes \cite commands to break with the following error:

Argument of \@citex has an extra }.
<inserted text> 
l.5 ...high ceiling") \cite{resnick_lifelong_2017}
                                              .  enter code here

The underscore character is made active by the syntax package and this confuses \cite.

You can disable the special treatment of the underscore by calling the package as

  • Better than the other answer I found - thanks – Chris Apr 20 '18 at 12:50

This turns out to be due to the syntax package altering the way that underscore characters are treated. The underscores in the reference name are the cause of the error.

I finally found the answer here:


Adding a line to return the underscore behaviour back to normal fixed the problem:

\AtBeginDocument{\catcode`\_=8 }

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