Core/Transports: Fixed crash happening during teleporting transports

Closes #11793
Merge branch 'master' of https://github.com/TrinityCore/TrinityCore into ghbb
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Merge pull request #39 from Unholychick/patch-3

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Merge pull request #40 from Unholychick/patch-3

Fix Nerf Scrapbots achievement
Merge branch 'master' of https://github.com/TrueWoW/TrinityCore into ghbb
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