From ac11dc90d899ce01b7c81c43c003510f3e4c9199 Mon Sep 17 00:00:00 2001
From: nifi <nifi>
Date: Tue, 30 Jun 2009 13:31:42 +0000
Subject: [PATCH] only reload with new seed if simulation exists

---
 tools/cooja/java/se/sics/cooja/GUI.java | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/tools/cooja/java/se/sics/cooja/GUI.java b/tools/cooja/java/se/sics/cooja/GUI.java
index 1c5b958aa..7bdc2cbbc 100644
--- a/tools/cooja/java/se/sics/cooja/GUI.java
+++ b/tools/cooja/java/se/sics/cooja/GUI.java
@@ -24,7 +24,7 @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
- * $Id: GUI.java,v 1.140 2009/06/30 13:10:14 nifi Exp $
+ * $Id: GUI.java,v 1.141 2009/06/30 13:31:42 nifi Exp $
  */
 
 package se.sics.cooja;
@@ -4009,8 +4009,10 @@ public class GUI extends Observable {
   GUIAction reloadRandomSimulationAction = new GUIAction("new random seed", KeyEvent.VK_N, KeyStroke.getKeyStroke(KeyEvent.VK_R, ActionEvent.CTRL_MASK | ActionEvent.SHIFT_MASK)) {
     public void actionPerformed(ActionEvent e) {
       /* Replace seed before reloading */
-      getSimulation().setRandomSeed(getSimulation().getRandomSeed()+1);
-      reloadSimulationAction.actionPerformed(null);
+      if (getSimulation() != null) {
+        getSimulation().setRandomSeed(getSimulation().getRandomSeed()+1);
+        reloadSimulationAction.actionPerformed(null);
+      }
     }
     public boolean shouldBeEnabled() {
       return getSimulation() != null;