[SDPhantom]

UNIT_SPELLCAST_START and UNIT_SPELLCAST_CHANNEL_START aren't returning the values that are nil. Those are from UnitCastingInfo(). The code doesn't check if the event firing is for the player while it only runs for the player castbar. So it's asking UnitCastingInfo() to check the player when the target starts casting.



I would suggest replacing this line to be a little more robust:

if (self.unit~="player") then return end

-with-

if not UnitIsUnit(self.unit,"player") or not UnitIsUnit(unit,"player") then return; end

This will also proc on other bars if the unit happens to be pointing to the player (like target if you're targeting yourself).

Alternate:

if self.unit~="player" or not UnitIsUnit(self.unit,unit) then return; end

This will still restrict to the player castbar, but still checks if the event is firing for it.