diff --git a/ChangeLog b/ChangeLog
index 8e8ea1671..ee8358704 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2007-12-23  Brian Matherly <brian@gramps-project.org>
+	* src/ReportBase/_Bibliography.py:
+  	 Fix 0001393: Detailed descendant report crash on too many references.
+
 2007-12-23 Raphael Ackermann <raphael.ackermann@gmail.com>
 	* src/plugins/ExtractCity.py: Fix #0001160: Regular expressions, 
 	dash/separator and non-ASCII characters on ExtractCity
diff --git a/src/ReportBase/_Bibliography.py b/src/ReportBase/_Bibliography.py
index 176f1b7dd..b8aebfe7b 100644
--- a/src/ReportBase/_Bibliography.py
+++ b/src/ReportBase/_Bibliography.py
@@ -72,7 +72,17 @@ class Citation:
         @return: The key of the added reference among all the references.
         @rtype: char
         """
-        key = string.lowercase[ len(self.__ref_list) ]
+        first_letter = ''
+        second_letter = ''
+        letter_count = len(string.lowercase)
+        ref_count = len(self.__ref_list)
+        if ref_count > letter_count:
+            # If there are more than 26 references, we need to use two 
+            # characters to uniquely identify them all.
+            first_letter = string.lowercase[ ref_count / letter_count ]
+        second_letter = string.lowercase[ ref_count % letter_count ]
+        
+        key = first_letter + second_letter
         self.__ref_list.append((key,source_ref))
         return key