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* For some unexplained reason, `mcl_burning.storage[player]` can sometimes be `nil`, causing a crash in `on_leaveplayer()`. This commit adds a check for that. If a `nil` is encountered, a sane value is substituted and a warning is set to the log.
* For some unexplained reason, `mcl_burning.storage[player]` can sometimes be `nil`, causing a crash in `on_leaveplayer()`. This commit adds a check for that. If a `nil` is encountered, a sane value is substituted and a warning is set to the log.