Zotero export update crashed biber

Question

Until I re-exported my library from Zotero, everything worked fine. Now with new references, something happened and I don't understand where the problem is. Nothing execpt for the reference.bib file has changed. I copy pasted all references from the original version of the referece.bib file to check whether it is some format that is changed but it also doesn't take that one. Running it in my console gives me the same output as running it in texmaker and as in the Main.bbl file:

Process started
INFO - This is Biber 2.14
INFO - Logfile is 'Main.blg'
INFO - Reading 'Main.bcf'
INFO - Found 14 citekeys in bib section 0
INFO - Processing section 0
INFO - Globbing data source 'references.bib'
INFO - Globbed data source 'references.bib' to references.bib
INFO - Looking for bibtex format file 'references.bib' for section 0 
INFO - LaTeX decoding ... INFO - Found BibTeX data source 'references.bib'
Process exited with error(s)

My Main.tex file is (in short, I don't exactly know what might be important)

\documentclass[a4paper, 11pt]{report}
\usepackage[english]{babel}
\usepackage{titlesec}
\usepackage{graphicx}
\usepackage{wrapfig}
\usepackage[normalem]{ulem}
\usepackage{geometry}
\geometry{a4paper, left=20mm, top=25mm, bottom=25mm, right=20mm, headheight=15pt}
\usepackage{setspace}
\onehalfspacing
\usepackage{csquotes}
\usepackage[backend=biber, style=nature]{biblatex}
\addbibresource{references.bib}
\usepackage{pdflscape}
\usepackage{rotating}
\usepackage{booktabs}
\usepackage[font=footnotesize]{caption}
\usepackage{siunitx}
\usepackage{longtable}
\usepackage{fontspec}
\defaultfontfeatures{Ligatures=TeX}
\begin{document}
\renewcommand{\bibname}{References}
\maketitle
\chapter{Summary}
\input{Chapters/Summary.tex}
\begin{spacing}{1}
\printbibliography[heading=bibintoc]
\end{spacing}
\end{document}

I use texmaker with Biber. The only intersting warning I can extract is

Please (re)run Biber on the file:
(biblatex) Main
(biblatex) and rerun LaTeX afterwards.

Does anybody know what is going on here, how I could find out what the problem is or maybe even how to fix it?

Thank you so much!