Index: lams_tool_preview/src/java/org/lamsfoundation/lams/tool/peerreview/util/SpreadsheetBuilder.java
===================================================================
diff -u -r24b187a7aa86f8975f9d4fabab3e7c2d03e33229 -rc469083ea309a7afc4058e793389a299dc66f02d
--- lams_tool_preview/src/java/org/lamsfoundation/lams/tool/peerreview/util/SpreadsheetBuilder.java	(.../SpreadsheetBuilder.java)	(revision 24b187a7aa86f8975f9d4fabab3e7c2d03e33229)
+++ lams_tool_preview/src/java/org/lamsfoundation/lams/tool/peerreview/util/SpreadsheetBuilder.java	(.../SpreadsheetBuilder.java)	(revision c469083ea309a7afc4058e793389a299dc66f02d)
@@ -221,6 +221,9 @@
     }
     
     private double roundTo2Places(double d) {
+	if ( Double.isNaN(d) )
+	    return 0D;
+	
 	BigDecimal bd = new BigDecimal(d);
 	bd = bd.setScale(2, RoundingMode.HALF_UP);
 	return bd.doubleValue();