java.lang.NullPointerException
	at org.weixin4j.util.TokenUtil$1.compare(TokenUtil.java:80)
	at org.weixin4j.util.TokenUtil$1.compare(TokenUtil.java:77)
	at java.util.TimSort.countRunAndMakeAscending(TimSort.java:324)
	at java.util.TimSort.sort(TimSort.java:189)
	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 org.weixin4j.util.TokenUtil.checkSignature(TokenUtil.java:77)