Varbanov was rushed to a nearby hospital, where he was pronounced dead.
Varbanov was the third employee in the past month and a half to die while working at the tourist attraction.
Monorail operator Austin Wuennenberg died after his train collided with another train on July 5. The 21-year-old had trauma throughout his body.
And just last Monday, 47-year-old Mark Priest died after falling on-stage four days earlier during a show called "Captain Jack's Pirate Tutorial" in the Magic Kingdom.
"We lost a valued cast member and our thoughts and prayers are with his friends and family as we mourn his passing," Disney spokeswoman Zoraya Suarez said in a statement.