Mulitplayer click bug

Step 1.) I opened up the Minecraft launcher and loaded up the 1.7.10 version of Minecraft.

Step 2.) Then i clicked Multiplayer and it crashed

This happens every time I click Multiplayer. Minecraft doesn't crash when i click Options, Single player, Minecraft Realms, (ect.)

It affects 1.7.10 but 1.7.10 wasn't in the selection