--- /DoubleMetaphone.java	2023-07-05 03:08:49.274033265 +0200
+++ /Codec-1/src/java/org/apache/commons/codec/language/DoubleMetaphone.java	2023-07-05 03:08:49.278033266 +0200
@@ -157,7 +157,7 @@
                 break;
             case 'Q':
                 result.append('K');
-                index = charAt(value, index + 1) == 'Q' ? index + 2 : index + 1;
+index = charAt ( value, index  >=  1 )  == 'Q' ? index + 2 : index + 1;
                 break;
             case 'R':
                 index = handleR(value, result, index, slavoGermanic);
