diff --git a/OpenSim/Framework/SLUtil.cs b/OpenSim/Framework/SLUtil.cs
index 9941a7f147..b337e034fa 100644
--- a/OpenSim/Framework/SLUtil.cs
+++ b/OpenSim/Framework/SLUtil.cs
@@ -340,7 +340,7 @@ namespace OpenSim.Framework
 
                         int count = -1;
 
-                        while (count < len)
+                        while (count < len && idx < input.Length)
                         {
                             // int l = input[idx].Length;
                             string ln = input[idx];
@@ -375,4 +375,4 @@ namespace OpenSim.Framework
             return output;
         }
     }
-}
\ No newline at end of file
+}