Not sure. Hope that it fixes the exception.

Exception: null
java.lang.NullPointerException
	at MonUserLat$Lat$1.compare(PerfMon.java:85)
		at MonUserLat$Lat$1.compare(PerfMon.java:82)
		at java.util.TimSort.countRunAndMakeAscending(TimSort.java:329)
		at java.util.TimSort.sort(TimSort.java:203)
		at java.util.TimSort.sort(TimSort.java:173)
		at java.util.Arrays.sort(Arrays.java:659)
		at java.util.Collections.sort(Collections.java:217)
		at MonUserLat._WriteResult(PerfMon.java:37)
		at MonUserLat.WriteResult(PerfMon.java:30)
		at Replay._LogStat(Replay.java:62)
		at Replay.Start(Replay.java:42)
		at Replay.main(Replay.java:138)