--- loncom/debugging_tools/modify_config_files.pl	2004/08/09 21:05:40	1.1
+++ loncom/debugging_tools/modify_config_files.pl	2004/08/10 20:26:02	1.2
@@ -2,7 +2,7 @@
 #
 # The LearningOnline Network
 #
-# $Id: modify_config_files.pl,v 1.1 2004/08/09 21:05:40 matthew Exp $
+# $Id: modify_config_files.pl,v 1.2 2004/08/10 20:26:02 matthew Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -259,7 +259,7 @@ sub modify_config_file {
             unshift(@$target,$newline);
         } else {
             # No need to put things after a blank line.
-            if ($target->[-1] =~ /^\s*$/) {
+            if (defined($target->[-1]) && $target->[-1] =~ /^\s*$/) {
                 $target->[-1] = $newline;
             } else {
                 push(@$target,$newline);