diff -r 30b840ed8c0e -r 822b7e3d064d src/main/java/de/uapcore/lightpit/dao/postgres/PGUserDao.java
--- a/src/main/java/de/uapcore/lightpit/dao/postgres/PGUserDao.java	Fri Oct 23 18:40:50 2020 +0200
+++ b/src/main/java/de/uapcore/lightpit/dao/postgres/PGUserDao.java	Fri Oct 23 20:34:57 2020 +0200
@@ -40,6 +40,7 @@
 import java.util.Objects;
 import java.util.Optional;
 
+import static de.uapcore.lightpit.dao.Functions.getSafeString;
 import static de.uapcore.lightpit.dao.Functions.setStringOrNull;
 
 public final class PGUserDao implements UserDao {
@@ -68,9 +69,9 @@
         if (id == 0) return null;
         final var user = new User(id);
         user.setUsername(result.getString("username"));
-        user.setGivenname(result.getString("givenname"));
-        user.setLastname(result.getString("lastname"));
-        user.setMail(result.getString("mail"));
+        user.setGivenname(getSafeString(result, "givenname"));
+        user.setLastname(getSafeString(result, "lastname"));
+        user.setMail(getSafeString(result, "mail"));
         return user;
     }