Incorrect sesskey submitted, form not accepted!

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Debug info:
Error code: invalidsesskey
Stack trace:
  • line 463 of /lib/setuplib.php: moodle_exception thrown
  • line 275 of /lib/formslib.php: call to print_error()
  • line 202 of /lib/formslib.php: call to moodleform->_process_submission()
  • line 577 of /mod/forum/post.php: call to moodleform->moodleform()