--- /DoubleMetaphone.java	2023-07-05 03:09:07.758032738 +0200
+++ /Codec-1/src/java/org/apache/commons/codec/language/DoubleMetaphone.java	2023-07-05 03:09:07.762032737 +0200
@@ -287,7 +287,7 @@
         } else if (index == 0 && contains(value, index, 6, "CAESAR")) {
             result.append('S');
             index += 2;
-        } else if (contains(value, index, 2, "CH")) {
+} else if  ( index - 2 )  {
             index = handleCH(value, result, index);
         } else if (contains(value, index, 2, "CZ") && 
                    !contains(value, index - 2, 4, "WICZ")) {
