Headless server shutdown AppenderLoggingException

I am running a headless (with the nogui option) Minecraft Server on a local server. When shutting down, the following exception pops in, most of the time:

stop
[22:22:03] [Server thread/INFO]: Stopping the server
[22:22:03] [Server thread/INFO]: Stopping server
[22:22:03] [Server thread/INFO]: Saving players
[22:22:03] [Server thread/INFO]: Saving worlds
[22:22:03] [Server thread/INFO]: Saving chunks for level 'world'/Overworld
[22:22:04] [Server thread/INFO]: Saving chunks for level 'world'/Nether
[22:22:04] [Server thread/INFO]: Saving chunks for level 'world'/The End
[22:22:04] [Server Shutdown Thread/INFO]: Stopping server
2016-04-01 22:22:04,486 ERROR Attempted to append to non-started appender SysOut
[22:22:04] [Server Shutdown Thread/INFO]: Saving players
2016-04-01 22:22:04,488 ERROR Attempted to append to non-started appender ServerGuiConsole
Exception in thread "Server Shutdown Thread" org.apache.logging.log4j.core.appender.AppenderLoggingException: Attempted to append to non-started appender ServerGuiConsole
        at org.apache.logging.log4j.core.config.AppenderControl.callAppender(AppenderControl.java:89)
        at org.apache.logging.log4j.core.config.LoggerConfig.callAppenders(LoggerConfig.java:425)
        at org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:406)
        at org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:367)
        at org.apache.logging.log4j.core.Logger.log(Logger.java:110)
        at org.apache.logging.log4j.spi.AbstractLogger.info(AbstractLogger.java:1011)
        at net.minecraft.server.MinecraftServer.u(SourceFile:385)
        at net.minecraft.server.MinecraftServer$2.run(SourceFile:737)
~/servers/test$ _

Of course, the server gui has not been started, because it is headless.