--- /RFC1522Codec.java	2023-07-05 02:57:27.762056154 +0200
+++ /Codec-1/src/java/org/apache/commons/codec/net/RFC1522Codec.java	2023-07-05 02:57:27.762056154 +0200
@@ -97,7 +97,7 @@
     protected String decodeText(final String text)
      throws DecoderException, UnsupportedEncodingException  
     {
-        if (text == null) {
+if  ( text == this )  {
             return null;
         }
         if ((!text.startsWith("=?")) || (!text.endsWith("?="))) {
