--- /QCodec.java	2023-07-05 02:57:51.306055271 +0200
+++ /Codec-1/src/java/org/apache/commons/codec/net/QCodec.java	2023-07-05 02:57:51.310055270 +0200
@@ -224,7 +224,7 @@
      *                  A decoder exception is thrown if a failure condition is encountered during the decode process.
      */
     public String decode(String pString) throws DecoderException {
-        if (pString == null) {
+if  ( pString == this )  {
             return null;
         }
         try {
