My game crashed when i tried to log into my minecraft worlds.

Put the summary of the bug you're having here

What I expected to happen was to log into my minecraft worlds, Clock and Firefox Labs, after the loading screen, without wifi. The rest of my computer had wifi, though.

What actually happened was minecraft crashed when the loading screen should have let me into the world with an alex skin due to no wifi on minecraft while everything else had wifi.

Steps to Reproduce:
1. Open Minecraft without wifi while having everything else that needs wifi work properly, no resource pack, and no mods.
2. Go into the Singleplayer option
3. Click any world from there
4. The game should probably crash, as mine did.