java.lang.NullPointerException
at java.util.Objects.requireNonNull(Objects.java:203)
at com.google.common.collect.LinkedListMultimap.removeNode(LinkedListMultimap.java:300)
at com.google.common.collect.LinkedListMultimap.access$300(LinkedListMultimap.java:101)
at com.google.common.collect.LinkedListMultimap$NodeIterator.remove(LinkedListMultimap.java:386)
at com.ctrip.framework.apollo.spring.property.SpringValueRegistry.scanAndClean(SpringValueRegistry.java:92)
at com.ctrip.framework.apollo.spring.property.SpringValueRegistry.access$000(SpringValueRegistry.java:36)
at com.ctrip.framework.apollo.spring.property.SpringValueRegistry$1.run(SpringValueRegistry.java:75)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:750)

version:1.9.1