Bug fix in registry

include/spdlog/details/logger_impl.h

@@ -37,6 +37,7 @@ inline spdlog::logger::logger(const std::string& logger_name, const It& begin, c
     _sinks(begin, end),
     _formatter(std::make_shared<pattern_formatter>("%+"))
 {
+
     // no support under vs2013 for member initialization for std::atomic
     _level = level::INFO;
 }

include/spdlog/details/registry.h

@@ -60,7 +60,8 @@ public:
             return found->second;
 
         auto new_logger = std::make_shared<logger>(logger_name, sinks_begin, sinks_end);
-        new_logger->set_formatter(_formatter);
+        if (_formatter)
+            new_logger->set_formatter(_formatter);
         new_logger->set_level(_level);
         _loggers[logger_name] = new_logger;
         return new_logger;