# RuntimeException: "Failed to start the session because headers have already been sent by?

**URL:** <https://forum.shopware.com/t/runtimeexception-failed-to-start-the-session-because-headers-have-already-been-sent-by/100985>\
**Category:** Shopware 6 (German)\
**Created:** [23. August 2023 um 13:19 UTC](https://forum.shopware.com/t/runtimeexception-failed-to-start-the-session-because-headers-have-already-been-sent-by/100985 "2023-08-23T13:19:47Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![inventbox](https://dub1.discourse-cdn.com/flex013/user_avatar/forum.shopware.com/inventbox/32/13134_2.png) [@inventbox](https://forum.shopware.com/u/inventbox)\
**Post date:** [19. Juni 2024 um 13:18 UTC](https://forum.shopware.com/t/runtimeexception-failed-to-start-the-session-because-headers-have-already-been-sent-by/100985/5 "2024-06-19T13:18:33Z")

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Hallo Alle,

bisher habe ich noch keinen Fehler, aber es gibt zumindest einen Ansatz. Hier der Beitrag welcher gerade zumindest in einen Richtung geht.  
Am besten Ihr schließt Euch alle dort an:

> [@Php - CRITICAL Uncaught Exception: Failed to start the session because headers have already been sent by](https://forum.shopware.com/t/php-critical-uncaught-exception-failed-to-start-the-session-because-headers-have-already-been-sent-by/101244):
>
> Hallo zusammen, wir nutzen die Shopware Version 6.4.20.1 und haben mehrere folgender Fehlermeldung im Log stehen: Uncaught Exception: Failed to start the session because headers have already been sent by „/home/beuoynmh/www.xxx.com/webshops/xxxSW6/vendor/symfony/http-foundation/Response.php“ at line 1250. {„exception“:„[object] (RuntimeException(code: 0): Failed to start the session because headers have already been sent by "/home/beuoynmh/www.xxxx.com/webshops/xxxSW6/vendor/symfony/http-found…

Grüße - Michael

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