Hello everyone! I am using Flink 1.16 with CEP, and I got this NullPointerException. The job just made a full restart from an inner exception, and around 10 minutes later, the NullPointerException appeared. Appreciate it very much if anyone can help.

2025-10-23 14:05:32,327 INFO  org.apache.flink.runtime.executiongraph.ExecutionGraph       [] - Match[7] -> Calc[8] -> SinkConversion[9] (21/96) (dcdc4daa8ced8ca9d2b8fc6c58e26129_310a79d541a763d57b050aae3bf30f0a_20_1) switched from INITIALIZING to RUNNING.
2025-10-23 14:05:32,327 INFO  org.apache.flink.runtime.executiongraph.ExecutionGraph       [] - Match[7] -> Calc[8] -> SinkConversion[9] (90/96) (dcdc4daa8ced8ca9d2b8fc6c58e26129_310a79d541a763d57b050aae3bf30f0a_89_1) switched from INITIALIZING to RUNNING.
2025-10-23 14:05:32,327 INFO  org.apache.flink.runtime.executiongraph.ExecutionGraph       [] - Match[7] -> Calc[8] -> SinkConversion[9] (59/96) (dcdc4daa8ced8ca9d2b8fc6c58e26129_310a79d541a763d57b050aae3bf30f0a_58_1) switched from INITIALIZING to RUNNING.
2025-10-23 14:05:32,327 INFO  org.apache.flink.runtime.executiongraph.ExecutionGraph       [] - Match[7] -> Calc[8] -> SinkConversion[9] (17/96) (dcdc4daa8ced8ca9d2b8fc6c58e26129_310a79d541a763d57b050aae3bf30f0a_16_1) switched from INITIALIZING to RUNNING.
2025-10-23 14:05:32,400 INFO  org.apache.flink.runtime.executiongraph.ExecutionGraph       [] - DelayableMessageProcess -> Sink: xiaoxiang_reach_system (1/1) (dcdc4daa8ced8ca9d2b8fc6c58e26129_0a53a086337bb3f8a33ad689643a92fc_0_1) switched from INITIALIZING to RUNNING.
2025-10-23 14:10:28,717 INFO  org.apache.flink.runtime.checkpoint.CheckpointCoordinator    [] - Triggering checkpoint 191 (type=CheckpointType{name='Checkpoint', sharingFilesStrategy=FORWARD_BACKWARD}) @ 1761199828716 for job ffffffffbd30e5570000000000000001.
2025-10-23 14:10:30,023 INFO  org.apache.flink.runtime.state.SharedStateRegistryImpl       [] - state self-sustained:true, lastCompletedCheckpoint:191, earliestDependent:9223372036854775807, highestNotClaimedCheckpointID:-1
2025-10-23 14:10:30,023 INFO  org.apache.flink.runtime.checkpoint.CheckpointCoordinator    [] - job ffffffffbd30e5570000000000000001 checkpoint 191 completed, job is state-sustained
2025-10-23 14:10:30,207 INFO  org.apache.flink.runtime.checkpoint.CheckpointCoordinator    [] - Completed checkpoint 191 for job ffffffffbd30e5570000000000000001 (280739389 bytes, checkpointDuration=1425 ms, finalizationTime=66 ms).
2025-10-23 14:15:28,717 INFO  org.apache.flink.runtime.checkpoint.CheckpointCoordinator    [] - Triggering checkpoint 192 (type=CheckpointType{name='Checkpoint', sharingFilesStrategy=FORWARD_BACKWARD}) @ 1761200128716 for job ffffffffbd30e5570000000000000001.
2025-10-23 14:15:29,030 INFO  org.apache.flink.runtime.state.SharedStateRegistryImpl       [] - state self-sustained:true, lastCompletedCheckpoint:192, earliestDependent:9223372036854775807, highestNotClaimedCheckpointID:-1
2025-10-23 14:15:29,030 INFO  org.apache.flink.runtime.checkpoint.CheckpointCoordinator    [] - job ffffffffbd30e5570000000000000001 checkpoint 192 completed, job is state-sustained
2025-10-23 14:15:29,096 INFO  org.apache.flink.runtime.checkpoint.CheckpointCoordinator    [] - Completed checkpoint 192 for job ffffffffbd30e5570000000000000001 (317081932 bytes, checkpointDuration=335 ms, finalizationTime=45 ms).
2025-10-23 14:16:37,533 INFO  org.apache.flink.runtime.executiongraph.ExecutionGraph       [] - Match[7] -> Calc[8] -> SinkConversion[9] (12/96) (dcdc4daa8ced8ca9d2b8fc6c58e26129_310a79d541a763d57b050aae3bf30f0a_11_1) switched from RUNNING to FAILED on session-2123414-1761142270-taskmanager-1-10 @ hldy-data-k8s-flink-ssd-node03895.mt (dataPort=23347).
java.lang.NullPointerException: null
	at org.apache.flink.cep.nfa.sharedbuffer.SharedBufferAccessor.materializeMatch(SharedBufferAccessor.java:213) ~[flink-cep-1.16.1.jar:1.16.1]
	at org.apache.flink.cep.nfa.NFA.processMatchesAccordingToSkipStrategy(NFA.java:474) ~[flink-cep-1.16.1.jar:1.16.1]
	at org.apache.flink.cep.nfa.NFA.advanceTime(NFA.java:337) ~[flink-cep-1.16.1.jar:1.16.1]
	at org.apache.flink.cep.operator.CepOperator.advanceTime(CepOperator.java:429) ~[flink-cep-1.16.1.jar:1.16.1]
	at org.apache.flink.cep.operator.CepOperator.onEventTime(CepOperator.java:325) ~[flink-cep-1.16.1.jar:1.16.1]
	at org.apache.flink.streaming.api.operators.InternalTimerServiceImpl.advanceWatermark(InternalTimerServiceImpl.java:302) ~[flink-dist-1.16.1.jar:1.16.1]
	at org.apache.flink.streaming.api.operators.InternalTimeServiceManagerImpl.advanceWatermark(InternalTimeServiceManagerImpl.java:180) ~[flink-dist-1.16.1.jar:1.16.1]
	at org.apache.flink.streaming.api.operators.AbstractStreamOperator.processWatermark(AbstractStreamOperator.java:599) ~[flink-dist-1.16.1.jar:1.16.1]
	at org.apache.flink.streaming.runtime.tasks.OneInputStreamTask$StreamTaskNetworkOutput.emitWatermark(OneInputStreamTask.java:239) ~[flink-dist-1.16.1.jar:1.16.1]
	at org.apache.flink.streaming.runtime.watermarkstatus.StatusWatermarkValve.findAndOutputNewMinWatermarkAcrossAlignedChannels(StatusWatermarkValve.java:200) ~[flink-dist-1.16.1.jar:1.16.1]
	at org.apache.flink.streaming.runtime.watermarkstatus.StatusWatermarkValve.inputWatermark(StatusWatermarkValve.java:105) ~[flink-dist-1.16.1.jar:1.16.1]
	at org.apache.flink.streaming.runtime.io.AbstractStreamTaskNetworkInput.processElement(AbstractStreamTaskNetworkInput.java:136) ~[flink-dist-1.16.1.jar:1.16.1]
	at org.apache.flink.streaming.runtime.io.AbstractStreamTaskNetworkInput.emitNext(AbstractStreamTaskNetworkInput.java:105) ~[flink-dist-1.16.1.jar:1.16.1]
	at org.apache.flink.streaming.runtime.io.StreamOneInputProcessor.processInput(StreamOneInputProcessor.java:65) ~[flink-dist-1.16.1.jar:1.16.1]
	at org.apache.flink.streaming.runtime.tasks.StreamTask.processInput(StreamTask.java:552) ~[flink-dist-1.16.1.jar:1.16.1]
	at org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.runMailboxLoop(MailboxProcessor.java:231) ~[flink-dist-1.16.1.jar:1.16.1]
	at org.apache.flink.streaming.runtime.tasks.StreamTask.runMailboxLoop(StreamTask.java:843) ~[flink-dist-1.16.1.jar:1.16.1]
	at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:792) ~[flink-dist-1.16.1.jar:1.16.1]
	at org.apache.flink.runtime.taskmanager.Task.runWithSystemExitMonitoring(Task.java:969) ~[flink-dist-1.16.1.jar:1.16.1]
	at org.apache.flink.runtime.taskmanager.Task.restoreAndInvoke(Task.java:948) ~[flink-dist-1.16.1.jar:1.16.1]
	at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:751) ~[flink-dist-1.16.1.jar:1.16.1]
	at org.apache.flink.runtime.taskmanager.Task.run(Task.java:571) ~[flink-dist-1.16.1.jar:1.16.1]
	at java.lang.Thread.run(Thread.java:748) ~[?:1.8.0_312]
2025-10-23 14:16:37,534 INFO  org.apache.flink.runtime.executiongraph.failover.flip1.TaskManagerRestartStrategy [] - Received failure event: TaskFailureEvent{taskManagerId=session-2123414-1761142270-taskmanager-1-10, timestamp=1761200197533, cause=NullPointerException: null}, excluded: false
2025-10-23 14:16:37,534 INFO  org.apache.flink.runtime.executiongraph.failover.flip1.TaskManagerRestartStrategy [] - Resetting restart strategy state due to stable running period
2025-10-23 14:16:37,536 INFO  org.apache.flink.runtime.executiongraph.failover.flip1.ContinuousRestartLimitation [] - Earliest failure timestamp: 1761199499926, max continuous restart duration: 28800000 ms
2025-10-23 14:16:37,536 INFO  org.apache.flink.runtime.jobmaster.JobMaster                 [] - 423 tasks will be restarted to recover the failed task dcdc4daa8ced8ca9d2b8fc6c58e26129_310a79d541a763d57b050aae3bf30f0a_11_1.
2025-10-23 14:16:37,536 INFO  org.apache.flink.runtime.executiongraph.ExecutionGraph       [] - Job rt_scene_51697_staging (ffffffffbd30e5570000000000000001) switched from state RUNNING to RESTARTING.