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I'm getting this bizarre warning when using biber 2.14 (biblatex 3.14).

Package biblatex Warning: No driver for entry type ''.
(biblatex)                Using fallback driver on input line 131.

Line 131 reads: \printbibliography[heading=bibintoc]

How is this possible? My bibliography file was created with BibDesk and is valid.

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    What version of biblatex and Biber are you using? Do you use a custom data model? There were some changes to the entry field/type name normalisation in recent Biber updates that might have caused something like this. But I thought that was resolved. Is there any chance you can show us a small, yet fully compilable example document that reproduces the warning (tex.meta.stackexchange.com/q/228/35864, tex.meta.stackexchange.com/q/4407/35864)? – moewe May 18 '20 at 20:33
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    Ah, the issue I thought about is not fixed in Biber v2.14 yet. It's github.com/plk/biber/issues/299 (inspired by tex.stackexchange.com/q/520657/35864). Do you use an entry type that is not defined in the standard data model? – moewe May 18 '20 at 20:35
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    Since you are running Biber 2.14 it could be the issue mentioned in my last comment. But we can only say that with certainty if you can show us a document and .bib entry that reproduce the warning. Any chance you could cobble something together? – moewe May 19 '20 at 11:40
  • Thanks, you pointed me in the right direction. It was indeed a problem caused by a non-standard entry type. I will add an answer for further clarification. – vbwx May 19 '20 at 13:42
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As explained by moewe, this warning occurs when using an undefined entry type in the .bib file.

In my case, I updated to TeX Live 2020 some time after creating the .bib file; a part of that update was that the APA style for biblatex got updated to comply with the 7th edition. I was using @newsarticle in my bibliography, but this entry type has been removed in the latest version of biblatex-apa. Hence, the warning.

In case anyone wants to use @newsarticle regardless: \usepackage[style=apa6]{biblatex} or something similar should do the trick.

Better yet: Use @article instead, and replace the field newspaper with journal.

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