ArchLinux package by j0hannes #5299

JabRef 5.0.0-dev--2019-10-14----d2ddff574
Linux 5.3.6-zen1-1-zen amd64 
Java 12.0.2

$ java --version
openjdk 11.0.4 2019-07-16
OpenJDK Runtime Environment (build 11.0.4+11)
OpenJDK 64-Bit Server VM (build 11.0.4+11, mixed mode)
$ archlinux-java status
Available Java environments:
  java-11-openjdk (default)

• I have tested the latest development version from http://builds.jabref.org/master/ and the problem persists

An error with no description:

Author2000
Error while writing '/home/user/Documents/Literature/TPSA.pdf':
null

Finished writing XMP for 0 file (0 skipped, 1 errors).
Happens with different PDFs.
The event log is empty.

Steps to reproduce the behavior:

1. Create an entry
2. Add link to a local PDF in the General tab
3. Select this file
4. Tool - Write XMP...
5. A pop-up appears