Bibliography entries occasionally containing an extra comma

by hiccups   Last Updated September 11, 2019 15:23 PM

Occasionally, I am seeing extra commas being inserted in bibliography entries using natbib and the unsrtnat style. Why does this happen, and how can I fix this?

Here is a minimal example:

    title="{Title One}",
    title="{Title Two}",


This is a citation.~\cite{bib1}

%%This is another citation.~\cite{bib2} %% <--- if this line is uncommented, both bib entries will have an extra comma after the title



Here is a screenshot of what I see: (left shows the output with the line in the MWE commented, right when it is uncommented)

enter image description here

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