1 files changed, 3 insertions, 3 deletions
diff --git a/core/src/main/scala/org/apache/spark/scheduler/cluster/SimrSchedulerBackend.scala b/core/src/main/scala/org/apache/spark/scheduler/cluster/SimrSchedulerBackend.scala
index 513d74a08a..ee10aa061f 100644
--- a/core/src/main/scala/org/apache/spark/scheduler/cluster/SimrSchedulerBackend.scala
+++ b/core/src/main/scala/org/apache/spark/scheduler/cluster/SimrSchedulerBackend.scala
@@ -17,7 +17,6 @@
 
 package org.apache.spark.scheduler.cluster
 
-import org.apache.hadoop.conf.Configuration
 import org.apache.hadoop.fs.{Path, FileSystem}
 
 import org.apache.spark.{Logging, SparkContext, SparkEnv}
@@ -47,16 +46,17 @@ private[spark] class SimrSchedulerBackend(
 
     val conf = SparkHadoopUtil.get.newConfiguration(sc.conf)
     val fs = FileSystem.get(conf)
+    val appUIAddress = sc.ui.map(_.appUIAddress).getOrElse("")
 
     logInfo("Writing to HDFS file: "  + driverFilePath)
     logInfo("Writing Akka address: "  + driverUrl)
-    logInfo("Writing Spark UI Address: " + sc.ui.appUIAddress)
+    logInfo("Writing Spark UI Address: " + appUIAddress)
 
     // Create temporary file to prevent race condition where executors get empty driverUrl file
     val temp = fs.create(tmpPath, true)
     temp.writeUTF(driverUrl)
     temp.writeInt(maxCores)
-    temp.writeUTF(sc.ui.appUIAddress)
+    temp.writeUTF(appUIAddress)
     temp.close()
 
     // "Atomic" rename