Added check for Stateview, added socket cancel to finish all connect, send and receive operations immediately

src/Client.cpp

@@ -84,6 +84,7 @@ void TClient::Disconnect(std::string_view Reason) {
         if (ec) {
             beammp_debugf("Failed to shutdown client socket: {}", ec.message());
         }
+        mSocket.cancel();
         mSocket.close(ec);
         if (ec) {
             beammp_debugf("Failed to close client socket: {}", ec.message());

src/TLuaEngine.cpp

@@ -43,6 +43,8 @@ static sol::protected_function AddTraceback(sol::state_view StateView, sol::prot
 static std::optional<sol::function> GetLuaHandler(sol::state_view StateView, const std::string Handler, const std::string EventName);
 
 static std::optional<sol::function> GetLuaHandler(sol::state_view StateView, const std::string Handler, const std::string EventName) {
+    if (!StateView)
+        return std::nullopt;
     auto Res = StateView.safe_script("return " + Handler, sol::script_pass_on_error);
     if (!Res.valid()) {
         beammp_errorf("invalid handler for event \"{}\". handler: \"{}\"", EventName, Handler);