--- loncom/xml/scripttag.pm	2001/07/06 21:54:10	1.43
+++ loncom/xml/scripttag.pm	2001/07/09 04:10:30	1.44
@@ -256,9 +256,11 @@ sub start_physnet {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
     my $cbistylefile = &Apache::lonnet::getfile('/home/httpd/res/msu/physnet/cbi.sty');
     %$style = (%$style,&Apache::style::styleparser($target,$cbistylefile));
-    &Apache::lonxml::newparser($parser$$style{'physnet'});
+    if ( defined($$style{'physnet'}) ) {
+        &Apache::lonxml::newparser($parser,$$style{'physnet'});
+    }
 
-    return "";
+    return '';
 }