Index: /opt/opennms/opennms-1.3.9/opennms-dao/src/main/java/org/opennms/netmgt/dao/support/DefaultRrdDao.java
===================================================================
--- /opt/opennms/opennms-1.3.9/opennms-dao/src/main/java/org/opennms/netmgt/dao/support/DefaultRrdDao.java	(revision 8091)
+++ /opt/opennms/opennms-1.3.9/opennms-dao/src/main/java/org/opennms/netmgt/dao/support/DefaultRrdDao.java	(working copy)
@@ -113,7 +113,12 @@
         double[] values = new double[printLines.length];
         
         for(int i = 0; i < printLines.length; i++) {
-        	values[i] = Double.parseDouble(printLines[i]);
+        	try {
+				values[i] = Double.parseDouble(printLines[i]);
+			} catch (NumberFormatException e) {
+				// TODO Auto-generated catch block
+				values[i] = Double.NaN;
+			}
         }
         
         return values;