diff --git a/mozilla/webtools/bugzilla/Bugzilla/Config.pm b/mozilla/webtools/bugzilla/Bugzilla/Config.pm
index f56ffd78aaa..cab18b5a159 100644
--- a/mozilla/webtools/bugzilla/Bugzilla/Config.pm
+++ b/mozilla/webtools/bugzilla/Bugzilla/Config.pm
@@ -195,7 +195,9 @@ sub update_params {
     # Convert the old "ssl" parameter to the new "ssl_redirect" parameter.
     # Both "authenticated sessions" and "always" turn on "ssl_redirect"
     # when upgrading.
-    $param->{'ssl_redirect'} = 1 if $param->{'ssl'} ne 'never';
+    if (exists $param->{'ssl'} and $param->{'ssl'} ne 'never') {
+        $param->{'ssl_redirect'} = 1;
+    }
 
     # --- DEFAULTS FOR NEW PARAMS ---