"queue is empty" error when spamming casts and right click

[DoctorGester]

So basically you just pick a hero with a vector targeting spell, turn on quickcast, and then spam the shit out of this spell, while also spamming right-click, so you use ONLY right-click and spell hotkey. At some point it gives you:

[ W VScript ]: Script Runtime Error: scripts/vscripts/lib/vector_target.lua:585: queue is empty
in
[ W VScript ]: scripts/vscripts/lib/vector_target.lua:585: in function 'popFirst'
[ W VScript ]: scripts/vscripts/lib/vector_target.lua:323: in function <scripts/vscripts/lib/vector_target.lua:319>

I have no idea what exact clicks/presses you have to make, but it's really noticeable in a regular play, when you are trying to cast stuff quickly.