Created attachment 1076155 [details]
Bib file that shows the problem

Description of problem:
If some unicode characters are present in the .bib file, biber crashes without explanation.

Version-Release number of selected component (if applicable):
biber 1.8

How reproducible:
Easy

Steps to Reproduce:
1. Save attached test.bib somewhere
2. run biber --tool bad.bib

Actual results:
biber stops with exitcode 25 after logging "INFO - Found BibTeX data source 'bad.bib'" and the generated bad_bibertool.bib is empty

Expected results:
Biber should finish without error and the output file should contain the entry. Using the attached good.bib works,  where only the unicode charaters have been removed.

Additional info:
The same thing happens if biber is not run in --tool mode but in the process of building a document with latex.