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h2/src/main/org/h2/server/TcpServer.java

@@ -246,6 +246,7 @@ public class TcpServer implements Service {
         ArrayList list = new ArrayList(running);
         for (int i = 0; i < list.size(); i++) {
             TcpServerThread c = (TcpServerThread) list.get(i);
+            if (c != null) {
                 c.close();
                 try {
                     c.getThread().join(100);
@@ -254,6 +255,7 @@ public class TcpServer implements Service {
                 }
             }
         }
+    }
 
     public static void stopServer(int port, String password, int shutdownMode) {
         TcpServer server = (TcpServer) SERVERS.get("" + port);