[CRASH] Replay crashing after pressing backspace twice to go back

Seeking through the timeline in the replay client often leads to champions and minions disappearing from the game. In order to get them back I have to seek to a new location and hope they reappear. When I press backspace to go back 15 seconds, champions and minions often disappear. Pressing backspace again within 10 seconds causes a bugsplat and a client crash.