Fix for IE11 issue-all levels unlocked sporadically (#5006)
Fix for IE11 issue-all levels unlocked sporadically (#5006)

* Fix for IE11 issue-all levels unlocked sporadically

javatlacati/codecombat,codecombat/codecombat,codecombat/codecombat,javatlacati/codecombat,javatlacati/codecombat,javatlacati/codecombat,jeremiahyan/codecombat,jeremiahyan/codecombat,javatlacati/codecombat,codecombat/codecombat,jeremiahyan/codecombat,codecombat/codecombat,codecombat/codecombat,jeremiahyan/codecombat