Minecraft Launcher bug wiped everything

I went to go into my Minecraft Launcher and it showed a message that said something around the lines of Oops seems like you found a bug. There was nothing i closed my launcher reopened it and every version that i had was gone and when i went to look at my minecraft folder it was empty this was all that i saw. Pls help me i had a hardcore world that was 7 months old over 350 Hours and i really dont want to lose it so if anyone can help me pls do