# PER Buffer throws KeyError during training of SAC

**URL:** <https://discuss.ray.io/t/per-buffer-throws-keyerror-during-training-of-sac/22240>\
**Category:** RLlib\
**Created:** [April 7, 2025, 2:20pm UTC](https://discuss.ray.io/t/per-buffer-throws-keyerror-during-training-of-sac/22240 "2025-04-07T14:20:38Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![verdictlg](https://avatars.discourse-cdn.com/v4/letter/v/3be4f8/32.png) [@verdictlg](https://discuss.ray.io/u/verdictlg)\
**Post date:** [May 14, 2025, 7:20pm UTC](https://discuss.ray.io/t/per-buffer-throws-keyerror-during-training-of-sac/22240/2 "2025-05-14T19:20:29Z")

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Hi,

Facing the same issue, greatly appreciate any help.

Multiple issues having keyError at the same index slice - 2097151

Other issue with the same error - [Error occuring repeatedly during training at random time steps](https://discuss.ray.io/t/error-occuring-repeatedly-during-training-at-random-time-steps/21144)

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