diff --git a/model/src/main/java/li/strolch/model/Order.java b/model/src/main/java/li/strolch/model/Order.java
index 9dfd13be6..d10a6422d 100644
--- a/model/src/main/java/li/strolch/model/Order.java
+++ b/model/src/main/java/li/strolch/model/Order.java
@@ -330,6 +330,8 @@ public class Order extends AbstractStrolchRootElement implements StrolchRootElem
 
 	@Override
 	public String toString() {
+		if (this.version == null)
+			return getLocator().toString();
 		return getLocator() + ", Version: " + this.version.getVersion();
 	}
 
diff --git a/model/src/main/java/li/strolch/model/Resource.java b/model/src/main/java/li/strolch/model/Resource.java
index 1b5061526..0f75575d8 100644
--- a/model/src/main/java/li/strolch/model/Resource.java
+++ b/model/src/main/java/li/strolch/model/Resource.java
@@ -401,6 +401,8 @@ public class Resource extends AbstractStrolchRootElement implements StrolchRootE
 
 	@Override
 	public String toString() {
+		if (this.version == null)
+			return getLocator().toString();
 		return getLocator() + ", Version: " + this.version.getVersion();
 	}
 
diff --git a/model/src/main/java/li/strolch/model/activity/Activity.java b/model/src/main/java/li/strolch/model/activity/Activity.java
index a9462fd32..2c6c0e854 100644
--- a/model/src/main/java/li/strolch/model/activity/Activity.java
+++ b/model/src/main/java/li/strolch/model/activity/Activity.java
@@ -786,7 +786,7 @@ public class Activity extends AbstractStrolchRootElement
 		builder.append(getStart());
 		builder.append(", end=");
 		builder.append(getEnd());
-		if (isRootElement()) {
+		if (isRootElement() && this.version != null) {
 			builder.append(", version=");
 			builder.append(this.version.getVersion());
 		}