--- loncom/interface/lonprintout.pm	2017/01/29 23:53:55	1.655
+++ loncom/interface/lonprintout.pm	2017/05/29 22:43:07	1.658
@@ -1,7 +1,7 @@
 # The LearningOnline Network
 # Printout
 #
-# $Id: lonprintout.pm,v 1.655 2017/01/29 23:53:55 raeburn Exp $
+# $Id: lonprintout.pm,v 1.658 2017/05/29 22:43:07 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -40,7 +40,6 @@ use Apache::admannotations;
 use Apache::lonenc;
 use Apache::entities;
 use Apache::londefdef;
-use LONCAPA;
 # use Apache::structurelags;	# for language management.
 
 use File::Basename;
@@ -3453,7 +3452,9 @@ ENDPART
         if ($env{'request.enc'}) {
             $url = &Apache::lonenc::encrypted($url); 
         }
-        $URLback = $url.($url =~ /\?/) ? '&':'?'.'?symb='.$helper->{VARS}{'symb'};
+        if ($url ne '') {
+            $URLback = $url.(($url =~ /\?/) ? '&':'?').'symb='.$helper->{VARS}{'symb'};
+        }
     }
     #
     # Final adjustment of the font size: