[GH-ISSUE #1950] Undefined array key in DeduplicationHandler #839

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opened 2026-03-04 03:01:17 +03:00 by kerem · 1 comment

kerem commented

2026-03-04 03:01:17 +03:00

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Originally created by @markomilivojevic on GitHub (Mar 3, 2025).
Original GitHub issue: https://github.com/Seldaek/monolog/issues/1950

Monolog version 3.6.0

Getting:
Undefined array key 1 on line 117 in file /src/Monolog/Handler/DeduplicationHandler.php
Undefined array key 2 on line 117 in file /src/Monolog/Handler/DeduplicationHandler.php

It happens when there are too many errors in the deduplication file (about 1000) and possibly many requests trying to write to the same file.

Originally created by @markomilivojevic on GitHub (Mar 3, 2025). Original GitHub issue: https://github.com/Seldaek/monolog/issues/1950 Monolog version 3.6.0 Getting: Undefined array key 1 on line 117 in file /src/Monolog/Handler/DeduplicationHandler.php Undefined array key 2 on line 117 in file /src/Monolog/Handler/DeduplicationHandler.php It happens when there are too many errors in the deduplication file (about 1000) and possibly many requests trying to write to the same file.

kerem

2026-03-04 03:01:17 +03:00

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kerem commented

2026-03-04 03:01:19 +03:00

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@Seldaek commented on GitHub (Mar 15, 2025):

Ok I can see how with concurrent requests it could be that one reads a partially written line perhaps for a new error.. We probably just need to skip invalid lines if it's the last one, and then worst case we'll get duplicate writes. But then we also most likely need to lock the file while writing.

@Seldaek commented on GitHub (Mar 15, 2025): Ok I can see how with concurrent requests it could be that one reads a partially written line perhaps for a new error.. We probably just need to skip invalid lines if it's the last one, and then worst case we'll get duplicate writes. But then we also most likely need to lock the file while writing.