Issue: Convert Thread to Wiki not working

ErrorException: unserialize(): Error at offset 0 of 99 bytes - vault/core/controller/ui/imod/vw.php:999
Generated By: bangster, Wednesday at 10:58 PM
Stack Trace
#0 [internal function]: XenForo_Application::handlePhpError(8, 'unserialize(): ...', '/home/xfnawcc/p...', 999, Array)
#1 /home/xfnawcc/public_html/vault/core/controller/ui/imod/vw.php(999): unserialize('{"importid":"2"...')
#2 /home/xfnawcc/public_html/vault/core/controller/ui/imod/vw.php(52): vw_UI_iMod_Controller->process_import()
#3 /home/xfnawcc/public_html/library/vw/XenForo/ControllerPublic/Wiki/Moderate.php(51): vw_UI_iMod_Controller->execute()
#4 /home/xfnawcc/public_html/library/XenForo/FrontController.php(369): vw_XenForo_ControllerPublic_Wiki_Moderate->actionIndex()
#5 /home/xfnawcc/public_html/library/XenForo/FrontController.php(152): XenForo_FrontController->dispatch(Object(XenForo_RouteMatch))
#6 /home/xfnawcc/public_html/index.php(13): XenForo_FrontController->run()
#7 {main}
Request State
array(3) {
  ["url"] => string(63) "https://mb.nawcc.org/wiki-moderate/?do=processimport&task=45581"
  ["_GET"] => array(2) {
    ["do"] => string(13) "processimport"
    ["task"] => string(5) "45581"
  }
  ["_POST"] => array(3) {
    ["_xfToken"] => string(8) "********"
    ["do"] => string(13) "processimport"
    ["task"] => string(5) "45581"
  }
}