LaTeX (Bibtex) is generating [1] extra empty reference on ACM 2017 journal

Question

I am using ACM 2017 edition of .cls for my journal:

\documentclass[format=acmsmall, review=false, screen=true]{acmart}

using pdflatex on Overleaf and the below bibliography style:

% Bibliography
\bibliographystyle{ACM-Reference-Format-Journals}
\bibliography{acmsmall-sample-bibfile}

However, I am seeing an extra reference in my bibliography section having [1] and is empty. Can't seem to find a way to remove this extra empty reference. Any help is appreciated.

Answer 1

I had this problem and found the problem was called by an error in my bib file. I had written:

@article{perdew_82},
title = {...}, 
journal = {...},
etc., down to a final closing }

The correct entry should have been

@article{perdew_82,
title = {...}, 
journal = {...},
etc., down to a final closing }