diff --git a/boot/src/main/java/com/taobao/arthas/boot/Bootstrap.java b/boot/src/main/java/com/taobao/arthas/boot/Bootstrap.java
index e3685f157ebc194ca5839e78a9208d406fe058a4..31a745157663b316fcc345ea433c88ac6871ebf1 100644
--- a/boot/src/main/java/com/taobao/arthas/boot/Bootstrap.java
+++ b/boot/src/main/java/com/taobao/arthas/boot/Bootstrap.java
@@ -699,6 +699,12 @@ public class Bootstrap {
         result.append("Remote versions:\n");
 
 		List<String> remoteVersions = DownloadUtils.readRemoteVersions();
+		//npe fix
+        if(remoteVersions==null){
+            AnsiLog.error("Read remote versions fail");
+            return "";
+        }
+
 		Collections.reverse(remoteVersions);
 		for (String version : remoteVersions) {
 			result.append(" " + version).append('\n');