diff --git a/mozilla/webtools/bugzilla/.bzrrev b/mozilla/webtools/bugzilla/.bzrrev
index df32f5a8646..37094c7c00b 100644
--- a/mozilla/webtools/bugzilla/.bzrrev
+++ b/mozilla/webtools/bugzilla/.bzrrev
@@ -1 +1 @@
-8275
\ No newline at end of file
+8276
\ No newline at end of file
diff --git a/mozilla/webtools/bugzilla/Bugzilla/Constants.pm b/mozilla/webtools/bugzilla/Bugzilla/Constants.pm
index 59e67faa541..f4c1d89d1fe 100644
--- a/mozilla/webtools/bugzilla/Bugzilla/Constants.pm
+++ b/mozilla/webtools/bugzilla/Bugzilla/Constants.pm
@@ -569,7 +569,7 @@ use constant PASSWORD_SALT_LENGTH => 8;
 # via POST such as buglist.cgi. This value determines whether the redirect
 # can be safely done or not based on the web server's URI length setting.
 # See http://support.microsoft.com/kb/208427 for why MSIE is different
-use constant CGI_URI_LIMIT => $ENV{'HTTP_USER_AGENT'} =~ /MSIE/ ? 2083 : 8000;
+use constant CGI_URI_LIMIT => ($ENV{'HTTP_USER_AGENT'} || '') =~ /MSIE/ ? 2083 : 8000;
 
 # If the user isn't allowed to change a field, we must tell him who can.
 # We store the required permission set into the $PrivilegesRequired