--- a/nashorn/src/jdk/nashorn/internal/runtime/DebuggerSupport.java	Wed Jul 05 19:24:47 2017 +0200
+++ b/nashorn/src/jdk/nashorn/internal/runtime/DebuggerSupport.java	Wed Dec 04 14:37:51 2013 +0530
@@ -243,7 +243,7 @@
             return value.toString();
 
         case STRING:
-            return escape((String)value);
+            return escape(value.toString());
 
         case NUMBER:
             return JSType.toString(((Number)value).doubleValue());