I'm sorry, but the knowledge sources do not contain any explicit information about the session hook failing for no reason with an "aborted registration hook execution" error. The available sources discuss issues where the session hook interferes with the execution of other hooks (such as webhooks not being triggered if the session hook is not ordered last), but they do not mention unexplained failures or specific error messages like "aborted registration hook execution" related to the session hook itself. If you are experiencing this issue, it may be worth checking the order of your hooks and reviewing your configuration, as misconfiguration is a common cause of hook-related problems in Ory flows [Troubleshoot Ory Actions Webhook issues](https://www.ory.sh/docs/troubleshooting/troubleshoot-actions).