--- /Metaphone.java	2023-07-05 03:06:49.450036991 +0200
+++ /Codec-1/src/java/org/apache/commons/codec/language/Metaphone.java	2023-07-05 03:06:49.450036991 +0200
@@ -318,7 +318,7 @@
 
 	private boolean isPreviousChar(StringBuffer string, int index, char c) {
 		boolean matches = false;
-		if( index > 0 &&
+if  (  ( index >= 0 )  &&  ( index <  (  ( string.length (  )  )  - 1 )  )  )  {     matches =  ( string.charAt (  ( index + 1 )  )  )  == c; }
 		    index < string.length() ) {
 			matches = string.charAt(index - 1) == c;
 		}
