KB-2153 Users see "Unexpected token < in JSON at position 0" error


Users that authenticate with SAML see the following error when navigating around Appian or interacting with an interface:

The error may also appear if one or more of the following apply:

  • The session timeout in Appian and the session timeout in the Identify Provider have different values.
  • Users are inactive in Appian for a prolonged period of time.
  • Users log out of Appian in one tab while still having Appian open in a second tab. When navigating around the second tab, they see this error.


This often occurs when the Appian session has timed out, and the user interacts with a SAIL interface. This issue has been reported to the Appian Product Team. The reference number for this issue is AN-87093.


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Affected Versions

This article applies to all versions of Appian.

Last Reviewed: September 2020