Originally Posted by Lesteryoung
Any ideas as to why? It seems to happen inside instances.
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Patch 7.1 disabled the player location API in instances. Blizzard stated beforehand that it should fail silently, but they lied, like they usually do when PR and code mix, since no one involved with PR actually knows or understands code changes. Same thing happened in 7.2 when they protected friendly nameplates, which spat many errors as well.
If this is your code, you're going to have to account for any location-based API, such as coordinates or facing, returning nil values. If this is an addon you are using, update it.