JabRef 4.0-dev--snapshot--2017-08-02--master--63414b030
Windows 10 10.0 amd64
Java 1.8.0_66
Steps to reproduce:

1. Type a known author in the search box
2. When the first suggestion comes up, hit enter
3. Now press shift+home to select the entire content of the search box and press del
4. The first bib entry is removed (in addition to the contents of the search box)