Don't start a STKHost if neither client nor server is requested.

src/main.cpp

@@ -779,7 +779,7 @@ int handleCmdLine()
         STKHost::create(/*is_Server*/true);
         Log::info("main", "Creating a server.");
     }   
-    else
+    else if(CommandLine::has("--client"))
     {
         STKHost::create(/*is_server*/false);
         Log::info("main", "Creating a client.");

src/main_loop.cpp

@@ -32,6 +32,7 @@
 #include "modes/world.hpp"
 #include "network/protocol_manager.hpp"
 #include "network/network_world.hpp"
+#include "network/stk_host.hpp"
 #include "online/request_manager.hpp"
 #include "race/race_manager.hpp"
 #include "states_screens/state_manager.hpp"
@@ -176,6 +177,7 @@ void MainLoop::run()
             PROFILER_POP_CPU_MARKER();
 
             PROFILER_PUSH_CPU_MARKER("Protocol manager update", 0x7F, 0x00, 0x7F);
+            if (STKHost::isNetworking())
                 ProtocolManager::getInstance()->update();
             PROFILER_POP_CPU_MARKER();
 
@@ -186,6 +188,7 @@ void MainLoop::run()
         else if (!m_abort && ProfileWorld::isNoGraphics())
         {
             PROFILER_PUSH_CPU_MARKER("Protocol manager update", 0x7F, 0x00, 0x7F);
+            if(STKHost::isNetworking())
                 ProtocolManager::getInstance()->update();
             PROFILER_POP_CPU_MARKER();
 

src/network/stk_host.hpp

@@ -124,6 +124,10 @@ public:
         m_stk_host = NULL;
     }
     // ------------------------------------------------------------------------
+    /** Return if a network setting is happening. A network setting is active
+     *  if a host (server or client) exists. */
+    static bool isNetworking() { return m_stk_host!=NULL; }
+    // ------------------------------------------------------------------------
 
     static void* mainLoop(void* self);