Tracy Morgan caused a lengthy delay at the Knicks game Monday night ... after he upchucked all over the floor.
The troubling scene unfolded during the first half of New York's tilt with the Miami Heat at Madison Square Garden ... when the comedian suddenly got sick in his courtside chair.
Images taken by fans at the arena show Morgan vomited near his feet ... and so much came out of his stomach, some of the contents actually splashed onto MSG's playing area.