# Null pointer exception at  com.wowza.wms.stream.MediaStreamMap.removeDvrRecorder

**URL:** <https://community.wowza.com/t/null-pointer-exception-at-com-wowza-wms-stream-mediastreammap-removedvrrecorder/42118>\
**Category:** Wowza Streaming Engine\
**Created:** [February 16, 2015, 3:42pm UTC](https://community.wowza.com/t/null-pointer-exception-at-com-wowza-wms-stream-mediastreammap-removedvrrecorder/42118 "2015-02-16T15:42:13Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Ofer\_Herman](https://avatars.discourse-cdn.com/v4/letter/o/a8b319/32.png) [@Ofer\_Herman](https://community.wowza.com/u/Ofer_Herman)\
**Post date:** [February 16, 2015, 3:42pm UTC](https://community.wowza.com/t/null-pointer-exception-at-com-wowza-wms-stream-mediastreammap-removedvrrecorder/42118/1 "2015-02-16T15:42:13Z")

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Hi,

we are running Wowza on 5 live streams and getting these exceptions after several hours, after that wowza starts to have high CPU and the streaming is stuck.

comment server ERROR 500 - DvrPacketHandler.handlePacket[live/_definst_/540dd643e4b0068600cb2eb1\_900kbps\_480x270.stream]: java.util.MissingFormatArgumentException: Format specifier ‘s’|

at java.util.Formatter.format(Formatter.java:2487)|

at java.util.Formatter.format(Formatter.java:2423)

|at java.lang.String.format(String.java:2792)|

at com.wowza.wms.dvr.DvrStreamStoreBase.createChunkArtifact(DvrStreamStoreBase.java:1333)|

at com.wowza.wms.dvr.DvrStreamStoreBase.addOnMetadataChunk(DvrStreamStoreBase.java:1295)

comment server ERROR 500 - IdleWorkerUtil: run.work : java.lang.NullPointerException|at com.wowza.wms.stream.MediaStreamMap.removeDvrRecorder(MediaStreamMap.java:2035)|

at com.wowza.wms.stream.livedvr.LiveStreamDvrRecorderBase.checkTimeout(LiveStreamDvrRecorderBase.java:541)|

at com.wowza.wms.stream.livedvr.LiveStreamDvrRecorderBase.onIdle(LiveStreamDvrRecorderBase.java:453)|

at com.wowza.wms.util.IdleWorkerUtil.run(IdleWorkerUtil.java:111)|

Please advise,

Ofer

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<div class="post-metadata">

**Author:** ![sal\_jefferson](https://avatars.discourse-cdn.com/v4/letter/s/6de8d8/32.png) [@sal\_jefferson](https://community.wowza.com/u/sal_jefferson)\
**Post date:** [February 17, 2015, 10:26am UTC](https://community.wowza.com/t/null-pointer-exception-at-com-wowza-wms-stream-mediastreammap-removedvrrecorder/42118/2 "2015-02-17T10:26:51Z")

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Ofer, please open a support ticket by sending the following zipped folders to support@wowza.com:

**[install-dir]/conf**

**[install-dir]/logs**

**[install-dir]/manager/logs**

This guide provides more details about opening support tickets:

[How to create a compressed zip file in Windows, OS X, and Linux](https://www.wowza.com/docs/how-to-create-a-compressed-zip-file-in-windows-os-x-and-linux)

Kind regards,

Salvadore