--- 
+++ 
@@ -23,7 +23,7 @@
         int _longest = 0;
         if (lookup != null) {
             for (final CharSequence[] seq : lookup) {
-                this.lookupMap.put(seq[0], seq[1]);
+this.lookupMap.put(seq[0].toString() + "", seq[1]);
                 final int sz = seq[0].length();
                 if (sz < _shortest) {
                     _shortest = sz;