diff --git a/src/main/java/eva2/optimization/individuals/AbstractEAIndividual.java b/src/main/java/eva2/optimization/individuals/AbstractEAIndividual.java
index e1f3e3c1..37a8562d 100644
--- a/src/main/java/eva2/optimization/individuals/AbstractEAIndividual.java
+++ b/src/main/java/eva2/optimization/individuals/AbstractEAIndividual.java
@@ -1088,7 +1088,7 @@ public abstract class AbstractEAIndividual implements IndividualInterface, java.
             }
             return pos;
         } // TODO check some more types here?
-        EVAERROR.errorMsgOnce("Unhandled case in AbstractEAIndividual.getPosition()!");
+        EVAERROR.errorMsgOnce("Unhandled case in AbstractEAIndividual.getDoublePositionShallow()!");
         return null;
     }
 
diff --git a/src/test/java/eva2/optimization/population/PopulationTest.java b/src/test/java/eva2/optimization/population/PopulationTest.java
index 9b74d848..ad978339 100644
--- a/src/test/java/eva2/optimization/population/PopulationTest.java
+++ b/src/test/java/eva2/optimization/population/PopulationTest.java
@@ -386,6 +386,19 @@ public class PopulationTest {
 
     @Test
     public void testFilterByFitness() throws Exception {
+        ESIndividualDoubleData indy1, indy2, indy3;
+        indy1 = new ESIndividualDoubleData();
+        indy1.setFitness(new double[]{100.0});
+        indy2 = new ESIndividualDoubleData();
+        indy2.setFitness(new double[]{10.0});
+        indy3 = new ESIndividualDoubleData();
+        indy3.setFitness(new double[]{1.0});
 
+        emptyPopulation.add(indy1);
+        emptyPopulation.add(indy2);
+        emptyPopulation.add(indy2);
+
+        // Get all individuals with fitness <= 10.0 (first fitness dimension)
+        assertEquals(2, emptyPopulation.filterByFitness(10.0, 0).size());
     }
 }
\ No newline at end of file