# ERROR 500 - MediaCacheItemBase.saveBlock : java.lang.NullPointerException

**URL:** https://community.wowza.com/t/error-500-mediacacheitembase-saveblock-java-lang-nullpointerexception/51308
**Category:** Wowza Streaming Engine
**Created:** [May 11, 2018, 10:17pm UTC](https://community.wowza.com/t/error-500-mediacacheitembase-saveblock-java-lang-nullpointerexception/51308 "2018-05-11T22:17:22Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![Matt\_Handley](https://avatars.discourse-cdn.com/v4/letter/m/a5b964/32.png) [@Matt\_Handley](https://community.wowza.com/u/Matt_Handley)
#### Post date: [May 11, 2018, 10:17pm UTC](https://community.wowza.com/t/error-500-mediacacheitembase-saveblock-java-lang-nullpointerexception/51308/1 "2018-05-11T22:17:22Z")

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On a pair of Edge servers I see that a few files got “stuck” in the media cache folders, and this error occurs

ERROR 500 - MediaCacheItemBase.saveBlock : java.lang.NullPointerException

The files were weeks old, though the time to live was a most 20 minutes.

Any ideas?