diff -r 2a90d105edec -r dd0a45ae25d7 src/main/java/de/uapcore/lightpit/dao/postgres/PGProjectDao.java
--- a/src/main/java/de/uapcore/lightpit/dao/postgres/PGProjectDao.java	Sat May 16 11:37:57 2020 +0200
+++ b/src/main/java/de/uapcore/lightpit/dao/postgres/PGProjectDao.java	Sat May 16 13:29:44 2020 +0200
@@ -96,7 +96,7 @@
         insert.setString(1, instance.getName());
         setStringOrNull(insert, 2, instance.getDescription());
         setStringOrNull(insert, 3, instance.getRepoUrl());
-        setForeignKeyOrNull(insert, 4, instance.getOwner(), User::getUserID);
+        setForeignKeyOrNull(insert, 4, instance.getOwner(), User::getId);
         insert.executeUpdate();
     }
 
@@ -106,7 +106,7 @@
         update.setString(1, instance.getName());
         setStringOrNull(update, 2, instance.getDescription());
         setStringOrNull(update, 3, instance.getRepoUrl());
-        setForeignKeyOrNull(update, 4, instance.getOwner(), User::getUserID);
+        setForeignKeyOrNull(update, 4, instance.getOwner(), User::getId);
         update.setInt(5, instance.getId());
         return update.executeUpdate() > 0;
     }