--- loncom/auth/switchserver.pm	2021/08/11 17:03:03	1.58
+++ loncom/auth/switchserver.pm	2021/10/26 14:20:40	1.59
@@ -1,7 +1,7 @@
 # The LearningOnline Network
 # Switch Servers Handler
 #
-# $Id: switchserver.pm,v 1.58 2021/08/11 17:03:03 raeburn Exp $
+# $Id: switchserver.pm,v 1.59 2021/10/26 14:20:40 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -312,7 +312,7 @@ sub handler {
     }
     if ($env{'request.linkprot'}) {
         $info{'linkprot'} = $env{'request.linkprot'};
-    } elsif ($env{'request.linkkey'}) {
+    } elsif ($env{'request.linkkey'} ne '') {
         $info{'linkkey'} = $env{'request.linkkey'};
     }
     if ($env{'request.deeplink.login'}) {