Error on server close (1.7.7 & 1.7.8)

Upon exiting my server, I receive a strange error:

[15:58:24] [Server Shutdown Thread/INFO]: Stopping server
2014-04-11 15:58:24,045 ERROR Attempted to append to non-started appender SysOut

[15:58:24] [Server Shutdown Thread/INFO]: Saving players
2014-04-11 15:58:24,048 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.o(SourceFile:302)
        at lh.run(SourceFile:616)

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