--- loncom/xml/lontexconvert.pm	2006/10/23 18:49:47	1.79
+++ loncom/xml/lontexconvert.pm	2006/10/24 01:28:47	1.80
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # TeX Conversion Module
 #
-# $Id: lontexconvert.pm,v 1.79 2006/10/23 18:49:47 albertel Exp $
+# $Id: lontexconvert.pm,v 1.80 2006/10/24 01:28:47 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -184,6 +184,10 @@ sub jsMath_converted {
 	push(@jsMath_sent_header,0);
     }
     sub jsMath_header {
+	if (!@jsMath_sent_header) {
+	    &Apache::lonnet::logthis("mismatched calls of jsMath_header and jsMath_process");
+	    return '';
+	}
 	return '' if $jsMath_sent_header[-1];
 	$jsMath_sent_header[-1]=1;
 	return