diff --git a/src/eva2/OptimizerFactory.java b/src/eva2/OptimizerFactory.java
index 1870507d..0106a942 100644
--- a/src/eva2/OptimizerFactory.java
+++ b/src/eva2/OptimizerFactory.java
@@ -160,7 +160,7 @@ public class OptimizerFactory {
 		de.addPopulationChangedEventListener(listener);
 		de.init();
 
-		listener.registerPopulationStateChanged(de.getPopulation(), "");
+		if (listener!=null) listener.registerPopulationStateChanged(de.getPopulation(), "");
 
 		return de;
 	}
@@ -388,7 +388,7 @@ public class OptimizerFactory {
 		hc.SetProblem(problem);
 		hc.init();
 
-		listener.registerPopulationStateChanged(hc.getPopulation(), "");
+		if (listener != null) listener.registerPopulationStateChanged(hc.getPopulation(), "");
 
 		return hc;
 	}
@@ -419,7 +419,7 @@ public class OptimizerFactory {
 		mc.SetProblem(problem);
 		mc.init();
 
-		listener.registerPopulationStateChanged(mc.getPopulation(), "");
+		if (listener != null) listener.registerPopulationStateChanged(mc.getPopulation(), "");
 
 		return mc;
 	}
@@ -465,7 +465,7 @@ public class OptimizerFactory {
 		pso.addPopulationChangedEventListener(listener);
 		pso.init();
 
-		listener.registerPopulationStateChanged(pso.getPopulation(), "");
+		if (listener != null) listener.registerPopulationStateChanged(pso.getPopulation(), "");
 
 		return pso;
 	}
@@ -506,7 +506,7 @@ public class OptimizerFactory {
 		sa.addPopulationChangedEventListener(listener);
 		sa.init();
 
-		listener.registerPopulationStateChanged(sa.getPopulation(), "");
+		if (listener!=null) listener.registerPopulationStateChanged(sa.getPopulation(), "");
 
 		return sa;
 	}
diff --git a/src/eva2/gui/PropertySheetPanel.java b/src/eva2/gui/PropertySheetPanel.java
index 8a952032..cd504d55 100644
--- a/src/eva2/gui/PropertySheetPanel.java
+++ b/src/eva2/gui/PropertySheetPanel.java
@@ -430,6 +430,7 @@ public class PropertySheetPanel extends JPanel implements PropertyChangeListener
 			String  name    = oldProps[i].getDisplayName();
 			if (name.compareTo(string)==0) return i;
 		}
+		System.err.println("Error, property not found: " + string);
 		return -1;
 	}
 
diff --git a/src/eva2/server/go/operators/mutation/MutateESCovarianceMatrixAdaption.java b/src/eva2/server/go/operators/mutation/MutateESCovarianceMatrixAdaption.java
index 03eb2954..42f06e32 100644
--- a/src/eva2/server/go/operators/mutation/MutateESCovarianceMatrixAdaption.java
+++ b/src/eva2/server/go/operators/mutation/MutateESCovarianceMatrixAdaption.java
@@ -319,4 +319,4 @@ public class MutateESCovarianceMatrixAdaption implements InterfaceMutation, java
     public String initSigmaScalarTipText() {
         return "Set the initial sigma value.";
     }
-}
\ No newline at end of file
+}
diff --git a/src/eva2/server/go/problems/ExternalRuntimeProblem.java b/src/eva2/server/go/problems/ExternalRuntimeProblem.java
index 25cd5510..c8bd23ac 100644
--- a/src/eva2/server/go/problems/ExternalRuntimeProblem.java
+++ b/src/eva2/server/go/problems/ExternalRuntimeProblem.java
@@ -144,7 +144,6 @@ public class ExternalRuntimeProblem extends AbstractOptimizationProblem implemen
 
         x = getXVector(individual);
 
-     //TODO call external runtime
         double[] fit = eval(x);
         individual.SetFitness(fit);
 		        
diff --git a/src/eva2/tools/math/Mathematics.java b/src/eva2/tools/math/Mathematics.java
index b133bc13..1459a686 100644
--- a/src/eva2/tools/math/Mathematics.java
+++ b/src/eva2/tools/math/Mathematics.java
@@ -1066,17 +1066,20 @@ public class Mathematics {
 		double d = 0.;
 		for (int i=0; i<x.length; i++) {
 			double dimLen = range[i][1]-range[i][0];
-			if (dimLen <= 0.) EVAERROR.errorMsgOnce("Error in reflectBounds: empty range! (possibly multiple errors)");
-			if (x[i]<range[i][0]) {
-				viols++;
-				d = range[i][0]-x[i];
-				while (d > dimLen) d -= dimLen; // avoid violating the other bound immediately
-				x[i]=range[i][0]+d;
-			} else if (x[i]>range[i][1]) {
-				viols++;
-				d = x[i]-range[i][1];
-				while (d>dimLen) d -= dimLen; // avoid violating the other bound immediately
-				x[i]=range[i][1]-d;
+			if (dimLen <= 0.) {
+				EVAERROR.errorMsgOnce("Error in reflectBounds: empty range! (possibly multiple errors)");
+			} else {
+				if (x[i]<range[i][0]) {
+					viols++;
+					d = range[i][0]-x[i];
+					while (d > dimLen) d -= dimLen; // avoid violating the other bound immediately
+					x[i]=range[i][0]+d;
+				} else if (x[i]>range[i][1]) {
+					viols++;
+					d = x[i]-range[i][1];
+					while (d>dimLen) d -= dimLen; // avoid violating the other bound immediately
+					x[i]=range[i][1]-d;
+				}
 			}
 		}
 		return viols;