Slack posting issue!

[anthonycalvano]

I'm using OSticket v1.14.2 and plugin slack notifier v0.2. Every once in a while when a customer sends an email, slack won't get notified and I'll get an email from alerts that says:
Subject: Slack posting issue!
Error sending to: https://hooks.slack.com/services/T498U9066/B01... Http code: 400 curl-error: 0

When I click on the link provided I go to it and the page just says, invalid_payload

In the system logs I get the following error:
API Unexpected Data
thread_entry_recipients/to/1: Unexpected data received in API request