Vanilla Server in 1.7.10 crashes the game

When I try to join the server it crashes the game and it gives me this message :

The game crashed whilst unexpected error

Error: java.lang.ArithmeticException: / by zero

The exit code is -1

The server log says this after I join the server (Laxant is my username) :

[09:15:30] [Server thread/INFO]: Laxant joined the game

[09:15:30] [Server thread/INFO]: Laxant lost connection: TextComponent{text='You logged in from another location', siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null}}

[09:15:30] [Server thread/INFO]: Laxant left the game

[09:15:31] [Server thread/INFO]: Laxant lost connection: TranslatableComponent{key='disconnect.genericReason', args=[Internal Exception: java.io.IOException: Connection reset by peer], siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null}}

Im also going to attach the full minecraft crash log just in case it helps

Quote from Roman

Is the server also on Vanilla?

yup, both minecraft and the server are on vanilla

Quote from Roman

What is the address or the server in question?

ElCosoDelCoso.aternos.me

Quote from Roman

Please try deleting your playerfile: https://support.aternos.org/hc…lete-someones-player-file

Always be sure to have a backup of your server before changing anything. This video might help you: https://youtu.be/NbdMqD6ciO8.

I didn't work, the same error message comes up

Quote from Roman

Does the issue persist with a new world?

No, when I generate a new world it works fine, I would like to find a way to keep the world though

Now it's letting me join again