diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/RMAppsBlock.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/RMAppsBlock.java
index 715d9d9..198e961 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/RMAppsBlock.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/RMAppsBlock.java
@@ -110,7 +110,9 @@ protected void renderData(Block html) {
.append("\",\"")
.append(app.getFinalAppStatus())
.append("\",\"")
- .append(String.valueOf(app.getRunningContainers()))
+ .append(
+ app.getRunningContainers() == -1 ? "N/A" : String.valueOf(app
+ .getRunningContainers()))
.append("\",\"")
// Progress bar
.append("