diff --git a/tools/cooja/java/se/sics/cooja/plugins/VisTraffic.java b/tools/cooja/java/se/sics/cooja/plugins/VisTraffic.java
index 319f0fc65..6c679fdf8 100644
--- a/tools/cooja/java/se/sics/cooja/plugins/VisTraffic.java
+++ b/tools/cooja/java/se/sics/cooja/plugins/VisTraffic.java
@@ -26,7 +26,7 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- * $Id: VisTraffic.java,v 1.1 2006/08/21 12:13:07 fros4943 Exp $
+ * $Id: VisTraffic.java,v 1.2 2006/10/05 15:13:48 fros4943 Exp $
  */
 
 package se.sics.cooja.plugins;
@@ -85,7 +85,8 @@ public class VisTraffic extends Visualizer2D {
         g2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.2f));
         if (radioMedium != null && radioMedium.getLastTickConnections() != null) {
           for (RadioConnection conn: radioMedium.getLastTickConnections()) {
-            paintConnection(conn, g2d);
+            if (conn != null)
+              paintConnection(conn, g2d);
           }
         }
         getCurrentCanvas().repaint();