Crash when selecting 'Teleport to team member' in Spectator Mode

In the Spectator options I should be able to select players to teleport to via the team they are on (Teleport to team member). When I select 'Teleport to team member' my client instantly crashes. This is confirmed for 15w45a and was the same in 15w44b.

Steps to Reproduce:
1. Set gamemode to Spectator
2. Using the number keys, select Teams 'Teleport to team member'
3. Client will crash after selection has been made

Description: Unexpected error

java.lang.ArrayIndexOutOfBoundsException: -1
	at bch.b(SourceFile:718)
	at bhl$a.a(SourceFile:124)
	at bdi.a(SourceFile:102)
	at bdi.a(SourceFile:84)
	at bdi.a(SourceFile:64)
	at bci.a(SourceFile:151)
	at bms.a(SourceFile:1037)
	at bbz.as(SourceFile:967)
	at bbz.a(SourceFile:385)
	at net.minecraft.client.main.Main.main(SourceFile:125)