08:42:08,791 |-ERROR in ch.qos.logback.core.rolling.RollingFileAppender[FILE] - Appender [FILE] failed to append. java.lang.NullPointerException
at java.lang.NullPointerException
at at ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy.isTriggeringEvent(SizeBasedTriggeringPolicy.java:59)
at at ch.qos.logback.core.rolling.RollingFileAppender.subAppend(RollingFileAppender.java:143)
at at ch.qos.logback.core.OutputStreamAppender.append(OutputStreamAppender.java:103)
at at ch.qos.logback.core.UnsynchronizedAppenderBase.doAppend(UnsynchronizedAppenderBase.java:88)
at at ch.qos.logback.core.spi.AppenderAttachableImpl.appendLoopOnAppenders(AppenderAttachableImpl.java:48)
at at ch.qos.logback.classic.Logger.appendLoopOnAppenders(Logger.java:280)
at at ch.qos.logback.classic.Logger.callAppenders(Logger.java:267)
at at ch.qos.logback.classic.Logger.buildLoggingEventAndAppend(Logger.java:449)
at at ch.qos.logback.classic.Logger.filterAndLog_2(Logger.java:440)
at at ch.qos.logback.classic.Logger.info(Logger.java:615)

check under debugger maxFileSize is null.

if(invocationGate.skipFurtherWork())
return false;

long now = System.currentTimeMillis();
invocationGate.updateMaskIfNecessary(now);

return (activeFile.length() >= maxFileSize.getSize());
}