diff --git a/src/main/java/org/bdware/server/CMHttpServer.java b/src/main/java/org/bdware/server/CMHttpServer.java
index 9cb2416..bfff690 100644
--- a/src/main/java/org/bdware/server/CMHttpServer.java
+++ b/src/main/java/org/bdware/server/CMHttpServer.java
@@ -131,10 +131,10 @@ public class CMHttpServer {
         FileActions.setTextFileSuffixes(cmdConf.textFileSuffixes);
 
         // plugins
-        CMHttpHandler.wsPluginActions = cmdConf.wsPluginActions.split(",");
-        MasterClientFrameHandler.clientToAgentPlugins = cmdConf.clientToAgentPlugins.split(",");
-        NodeCenterClientHandler.clientToClusterPlugins = cmdConf.clientToClusterPlugins.split(",");
-        TCPClientFrameHandler.tcpPlugins = cmdConf.tcpPlugins.split(",");
+        CMHttpHandler.wsPluginActions = parseStrAsList(cmdConf.wsPluginActions);
+        MasterClientFrameHandler.clientToAgentPlugins = parseStrAsList(cmdConf.clientToAgentPlugins);
+        NodeCenterClientHandler.clientToClusterPlugins = parseStrAsList(cmdConf.clientToClusterPlugins);
+        TCPClientFrameHandler.tcpPlugins = parseStrAsList(cmdConf.tcpPlugins);
 
         if (!cmdConf.debug.isEmpty()) {
             try {
@@ -152,6 +152,12 @@ public class CMHttpServer {
         }
     }
 
+    private static String[] parseStrAsList(String str) {
+        if (str == null)
+            return new String[]{};
+        return str.split(",");
+    }
+
     private static void addDirToPath(String s) {
         try {
             LOGGER.info("add to path: " + s);
@@ -251,14 +257,19 @@ public class CMHttpServer {
         //   if (ContractManager.reconnectPort < 0) ContractManager.reconnectPort = 1630;
         File[] pluginJar = new File("./pluginLib/")
                 .listFiles(pathname -> pathname.getName().endsWith(".jar"));
-        URL[] urls = new URL[pluginJar.length];
-        for (int i = 0; i < pluginJar.length; i++) {
-            try {
-                urls[i] = pluginJar[i].toURI().toURL();
-                LOGGER.info("add plugin:" + pluginJar[i].getName());
-            } catch (MalformedURLException e) {
-                e.printStackTrace();
+        URL[] urls;
+        if (pluginJar != null && pluginJar.length > 0) {
+            urls = new URL[pluginJar.length];
+            for (int i = 0; i < pluginJar.length; i++) {
+                try {
+                    urls[i] = pluginJar[i].toURI().toURL();
+                    LOGGER.info("add plugin:" + pluginJar[i].getName());
+                } catch (MalformedURLException e) {
+                    e.printStackTrace();
+                }
             }
+        } else {
+            urls = new URL[]{};
         }
         pluginLoader = new URLClassLoader(urls, CMHttpServer.class.getClassLoader());
         if (port >= 18000 && port < 18100) {