diff --git a/pregelix/pregelix-core/src/main/java/edu/uci/ics/pregelix/core/driver/Driver.java b/pregelix/pregelix-core/src/main/java/edu/uci/ics/pregelix/core/driver/Driver.java
index f07a246..3a4c41b 100644
--- a/pregelix/pregelix-core/src/main/java/edu/uci/ics/pregelix/core/driver/Driver.java
+++ b/pregelix/pregelix-core/src/main/java/edu/uci/ics/pregelix/core/driver/Driver.java
@@ -75,11 +75,17 @@
         try {
             /** add hadoop configurations */
             URL hadoopCore = job.getClass().getClassLoader().getResource("core-site.xml");
-            job.getConfiguration().addResource(hadoopCore);
+            if (hadoopCore != null) {
+                job.getConfiguration().addResource(hadoopCore);
+            }
             URL hadoopMapRed = job.getClass().getClassLoader().getResource("mapred-site.xml");
-            job.getConfiguration().addResource(hadoopMapRed);
+            if (hadoopMapRed != null) {
+                job.getConfiguration().addResource(hadoopMapRed);
+            }
             URL hadoopHdfs = job.getClass().getClassLoader().getResource("hdfs-site.xml");
-            job.getConfiguration().addResource(hadoopHdfs);
+            if (hadoopHdfs != null) {
+                job.getConfiguration().addResource(hadoopHdfs);
+            }
             ClusterConfig.loadClusterConfig(ipAddress, port);
 
             LOG.info("job started");