Search Author-Name and then Grouping-table does not update any more

[JoKalliauer]

JabRef 4.3.1
Linux 4.15.0-24-generic amd64
Java 1.8.0_171

Steps to reproduce:

1. open input4196.bib
2. Search for "Schlappal"
   
3. Take the first one (Article/Masterthesis) and drag it to "Group1"
   
4. Check the groups if they are ok (Group1 should be highlithed)
5. Click on the other Entry (converence) and check the groups, and they do not update any more!
   

Termial

jkalliau@jkalliau-Z87M-D3H:~/Desktop$ java -jar /home/jkalliau/prgm/JabRef/JabRef-4.3.1.jar
17:28:55.341 [AWT-EventQueue-0] INFO  org.jabref.logic.importer.OpenDatabase - Opening: /home/jkalliau/ownCloud/PhDJK/LaTeX/Style/LiteratureJK.bib
17:28:55.684 [AWT-EventQueue-0] INFO  org.jabref.logic.importer.OpenDatabase - Opening: /home/jkalliau/Desktop/input.bib
File: grouptree.fxml not found, attempting with camel case
File: grouptree.css not found, attempting with camel case
File: errorconsole.fxml not found, attempting with camel case
File: errorconsole.css not found, attempting with camel case
Killed

[input4196.bib](https://github.com/JabRef/jabref/files/2189259/input4196.bib.txt)

% Encoding: UTF-8

@String { apr = {April} }
@String { aug = {August} }
@String { dec = {December} }
@String { feb = {February} }
@String { jan = {January} }
@String { jul = {July} }
@String { jun = {June} }
@String { mar = {March} }
@String { may = {May} }
@String { nov = {November} }
@String { oct = {October} }
@String { sep = {September} }

@Misc{wikiElastizitaetsmoduln,
  author       = {Kalliauer, Johannes},
  title        = {{Vorlage:Elastizit{\"{a}}tsmoduln}},
  howpublished = {Website},
  month        = jul,
  year         = {2013},
  note         = {\url{https://de.wikipedia.org/w/index.php?title=Vorlage:Elastizitätsmoduln&oldid=120750110 } [Online; date: 21-July-2013]},
  file         = {ZusammenhaengeZwischenElastizitätsmoduln-Wikipedia_php.mht:PhDJK/Literature/DNA/Weitere/ZusammenhaengeZwischenElastizitätsmoduln-Wikipedia_php.mht:MHT},
  groups       = {DNA, Web},
  keywords     = {rank2},
  url          = {\url{https://de.wikipedia.org/w/index.php?title=Vorlage:Elastizitätsmoduln&oldid=120750110
}},
  urldate      = {2013-07-21},
}

@TechReport{kalliauer2017structural,
  author    = {Kalliauer, Johannes and Hellmich, Christian},
  title     = {Structural mechanics of DNA},
  year      = {2017},
  type      = {resreport},
  address   = {Karslplatz 13/202, 1040 Wien},
  month     = dec,
  file      = {DNA.pdf:PhDJK/LaTeX/REFTable/DNA.pdf:PDF},
  groups    = {AnStefan},
  owner     = {jkalliau},
  school    = {TU Wien},
  timestamp = {2018.03.06},
}

@Article{Kalliauer2018,
  author     = {Kalliauer, Johannes and Schlappal, Thomas and Vill, Markus and Mang, Herbert and Pichler, Bernhard},
  title      = {Bearing capacity of concrete hinges subjected to eccentric compression: multiscale structural analysis of experiments},
  journal    = {Acta Mechanica},
  year       = {2018},
  volume     = {229},
  number     = {2},
  pages      = {849--866},
  month      = feb,
  issn       = {1619-6937},
  day        = {01},
  doi        = {10.1007/s00707-017-2004-3},
  file       = {Kalliauer2018Bearing.pdf:Master/IMWS/Text/TeX/ActaMechanica.pdf:PDF;
10.1007_s00707-017-2004-3.pdf:PhDJK/Literature/10.1007_s00707-017-2004-3.pdf:PDF;
Kalliauer2018Bearing.pdf:PhDJK/Literature/Kalliauer2018Bearing.pdf:PDF},
  groups     = {MasterThesis},
  keywords   = {read},
  owner      = {jkalliau},
  publisher  = {Springer Nature},
  timestamp  = {2018.03.06},
}

@Conference{kalliauer2018parameter,
  author       = {Kalliauer, Johannes and Schlappal, Thomas and Mang, Herbert A. and Pichler, Bernhard},
  title        = {Parameter identification as the basis for Finite Element simulations of Ultimate Limit States of concrete hinges},
  booktitle    = {Computational Modelling of Concrete Structures: Proceedings of the Conference on Computational Modelling of Concrete and Concrete Structures (EURO-C 2018), February 26 - March 1, 2018, Bad Hofgastein, Austria},
  year         = {2018},
  editor       = {Günther Meschke and Bernhard Pichler and {Jan G.} Rots},
  number       = {Euro-C2018},
  pages        = {689},
  organization = {CRC Press},
  file         = {Kalliauer_et_al_EUROC_Paper.pdf:Master/IMWS/Text/EuroC/HM/Kalliauer_et_al_EUROC_Paper.pdf:PDF},
  groups       = {Conference},
  keywords     = {read},
  owner        = {jkalliau},
  timestamp    = {2018.03.06},
  url          = {https://www.crcpress.com/Computational-Modelling-of-Concrete-Structures-Proceedings-of-the-Conference/Meschke-Pichler-Rots/p/book/9781138741171},
}

@Comment{jabref-meta: databaseType:bibtex;}

@Comment{jabref-meta: grouping:
0 AllEntriesGroup:;
1 StaticGroup:DNA\;0\;1\;\;\;\;;
1 StaticGroup:AnStefan\;0\;1\;\;\;\;;
1 StaticGroup:Group1\;0\;1\;\;\;\;;
1 StaticGroup:Group2\;0\;1\;\;\;\;;
1 StaticGroup:Group3\;0\;1\;\;\;\;;
1 StaticGroup:GroupA\;0\;1\;\;\;\;;
1 StaticGroup:GroupB\;0\;1\;\;\;\;;
1 StaticGroup:GroupC\;0\;1\;\;\;\;;
1 StaticGroup:Web\;0\;1\;\;\;\;;
1 StaticGroup:MasterThesis\;0\;1\;\;\;\;;
1 StaticGroup:Conference\;0\;1\;\;\;\;;
}

[JoKalliauer]

Most likely duplicate of #3112