JahiaQuartzScheduler error on shutdown

This error occurs everytime i restart or shutdown (4.1.0 b6070):

Stopping service Tomcat-Standalone
25/08/2006 13:23:26 org.apache.coyote.http11.Http11Protocol destroy
INFO: Stopping Coyote HTTP/1.1 on http-30080
1384949 [JahiaQuartzScheduler_Worker-2] ERROR
org.quartz.core.JobRunShell.run:200 - Job DEFAULT.scheduledIndexation_Job
threw an unhandled Exception:
java.lang.NullPointerException
        at
org.jahia.services.search.ScheduledIndexationJob.execute(ScheduledIndexationJob.java:46)
        at org.quartz.core.JobRunShell.run(JobRunShell.java:191)
        at
org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:516)
1384952 [JahiaQuartzScheduler_Worker-2] ERROR
org.quartz.core.ErrorLogger.schedulerError:1900 - Job
(DEFAULT.scheduledIndexation_Job threw an exception.
org.quartz.SchedulerException: Job threw an unhandled exception. [See nested
exception: java.lang.NullPointerException]
        at org.quartz.core.JobRunShell.run(JobRunShell.java:202)
        at
org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:516)
* Nested Exception (Underlying Cause) ---------------
java.lang.NullPointerException
        at
org.jahia.services.search.ScheduledIndexationJob.execute(ScheduledIndexationJob.java:46)
        at org.quartz.core.JobRunShell.run(JobRunShell.java:191)
        at
org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:516)
25/08/2006 13:23:30 org.apache.coyote.http11.Http11Protocol init

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