Everton and Hajduk Split players were led off the Goodison Park field midway through the first half of Thursday's Europa League qualifier after crowd trouble.
Away fans spilled onto the pitch shortly after Michael Keane had given Everton the lead with his first goal for the club.
Stewards clashed with Hajduk supporters as they attempted to force them back to the stands, while broken seats were seen thrown onto the pitch.
Hajduk Split players approached their travelling fans and appeared to appeal for calm as the game was brought to a halt by referee Ivan Kruzliak for several minutes.
Idrissa Gueye put Everton 2-0 up shortly after play resumed in the first half.