src/main/java/hhn/temp/project/provider/SimpleDatabaseManager.java

@@ -91,7 +91,7 @@ public class SimpleDatabaseManager<E> implements DatabaseManager<E> {
 
         task = new Task(
                 resultSet.getInt("taskid"),
-                resultSet.getInt("workderid"),
+                resultSet.getInt("workerid"),
                 resultSet.getString("name"),
                 resultSet.getString("description")
         );