diff --git a/tools/cooja/java/se/sics/cooja/plugins/LogScriptEngine.java b/tools/cooja/java/se/sics/cooja/plugins/LogScriptEngine.java
index c70f35fa0..15719b005 100644
--- a/tools/cooja/java/se/sics/cooja/plugins/LogScriptEngine.java
+++ b/tools/cooja/java/se/sics/cooja/plugins/LogScriptEngine.java
@@ -339,6 +339,7 @@ public class LogScriptEngine {
     engine.put("global", hash);
     engine.put("sim", simulation);
     engine.put("gui", simulation.getGUI());
+    engine.put("msg", new String(""));
 
     scriptMote = new ScriptMote();
     engine.put("node", scriptMote);