PHP Notice: Undefined index: state in /vendor/imsglobal/lti-1p3-tool/src/lti/LTI_Message_Launch.php on line 265

[marcbertone]

Error:
validate_state() method in the LTI_Message_Launch class does not properly handle NULL / not-set 'state' value.

Proposed Solution:
Perform an isset() or empty() check against $this->request['state'] before attempting to use the value in the cookie retrieval call. Throw an exception if the value is not set.