diff --git a/li.strolch.model/src/main/java/li/strolch/model/ParameterBag.java b/li.strolch.model/src/main/java/li/strolch/model/ParameterBag.java
index 8bc9541a4..2f530176e 100644
--- a/li.strolch.model/src/main/java/li/strolch/model/ParameterBag.java
+++ b/li.strolch.model/src/main/java/li/strolch/model/ParameterBag.java
@@ -51,7 +51,8 @@ public class ParameterBag extends ParameterizedElement {
 
 	@Override
 	public void fillLocator(LocatorBuilder lb) {
-		this.parent.fillLocator(lb);
+		if (this.parent != null)
+			this.parent.fillLocator(lb);
 		lb.append(Tags.BAG);
 		lb.append(this.id);
 	}
diff --git a/li.strolch.model/src/main/java/li/strolch/model/activity/Action.java b/li.strolch.model/src/main/java/li/strolch/model/activity/Action.java
index 639c1019b..ad395777f 100644
--- a/li.strolch.model/src/main/java/li/strolch/model/activity/Action.java
+++ b/li.strolch.model/src/main/java/li/strolch/model/activity/Action.java
@@ -211,7 +211,8 @@ public class Action extends GroupedParameterizedElement implements IActivityElem
 	@Override
 	public Locator getLocator() {
 		LocatorBuilder lb = new LocatorBuilder();
-		this.parent.fillLocator(lb);
+		if (this.parent != null)
+			this.parent.fillLocator(lb);
 		fillLocator(lb);
 		return lb.build();
 	}
diff --git a/li.strolch.model/src/main/java/li/strolch/model/parameter/AbstractParameter.java b/li.strolch.model/src/main/java/li/strolch/model/parameter/AbstractParameter.java
index 8a6f68025..4a736faab 100644
--- a/li.strolch.model/src/main/java/li/strolch/model/parameter/AbstractParameter.java
+++ b/li.strolch.model/src/main/java/li/strolch/model/parameter/AbstractParameter.java
@@ -138,7 +138,8 @@ public abstract class AbstractParameter<T> extends AbstractStrolchElement implem
 	@Override
 	public Locator getLocator() {
 		LocatorBuilder lb = new LocatorBuilder();
-		this.parent.fillLocator(lb);
+		if (this.parent != null)
+			this.parent.fillLocator(lb);
 		fillLocator(lb);
 		return lb.build();
 	}
diff --git a/li.strolch.model/src/main/java/li/strolch/model/timedstate/AbstractStrolchTimedState.java b/li.strolch.model/src/main/java/li/strolch/model/timedstate/AbstractStrolchTimedState.java
index 4f65d5fc6..81335703e 100644
--- a/li.strolch.model/src/main/java/li/strolch/model/timedstate/AbstractStrolchTimedState.java
+++ b/li.strolch.model/src/main/java/li/strolch/model/timedstate/AbstractStrolchTimedState.java
@@ -37,8 +37,8 @@ import li.strolch.utils.helper.StringHelper;
  * @author Robert von Burg <eitch@eitchnet.ch>
  */
 @SuppressWarnings("rawtypes")
-public abstract class AbstractStrolchTimedState<T extends IValue> extends AbstractStrolchElement implements
-		StrolchTimedState<T> {
+public abstract class AbstractStrolchTimedState<T extends IValue> extends AbstractStrolchElement
+		implements StrolchTimedState<T> {
 
 	private static final long serialVersionUID = 1L;
 
@@ -161,7 +161,8 @@ public abstract class AbstractStrolchTimedState<T extends IValue> extends Abstra
 	@Override
 	public Locator getLocator() {
 		LocatorBuilder lb = new LocatorBuilder();
-		this.parent.fillLocator(lb);
+		if (this.parent != null)
+			this.parent.fillLocator(lb);
 		fillLocator(lb);
 		return lb.build();
 	}