# Hashtable insert failed. Load factor too high -

**URL:** <https://discuss.hangfire.io/t/hashtable-insert-failed-load-factor-too-high/10786>\
**Category:** question\
**Tags:** sql-server\
**Created:** [July 4, 2024, 12:00pm UTC](https://discuss.hangfire.io/t/hashtable-insert-failed-load-factor-too-high/10786 "2024-07-04T12:00:31Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![beasty1711](https://avatars.discourse-cdn.com/v4/letter/b/c0e974/32.png) [@beasty1711](https://discuss.hangfire.io/u/beasty1711)\
**Post date:** [July 4, 2024, 12:00pm UTC](https://discuss.hangfire.io/t/hashtable-insert-failed-load-factor-too-high/10786/1 "2024-07-04T12:00:31Z")

</div>

Hi,  
I am getting the following error occur on production HangfireSessionStorage.GetSimpleSessionStorage(Nullable`1 uniqueId)  
I have two job queue servers running, with 20 threads per server. My app server can cope with up to 48 threads

```auto
"ExceptionType":"System.InvalidOperationException","ExceptionMessage":"Hashtable insert failed. Load factor too high. The most common cause is multiple threads writing to the Hashtable simultaneously.","ExceptionDetails":"System.InvalidOperationException: Hashtable insert failed. Load factor too high. The most common cause is multiple threads writing to the Hashtable simultaneously.\r\n at System.Collections.Hashtable.Insert(Object key, Object nvalue, Boolean add)\r\n at **strong text**

```

Has anyone come across this issue?