Crash after filling big area with 'minecraft:wheat'

My minecraft crashed after using /fill. When i re-opened the world, it crashed again. Also when i tried again. Unluckly, i don't have a recent backup of that world. do i realy have to start all over again?

After trying 8 times the world was removed from the world list. I could still find it in 'saves'.

The first report is when i entered the /fill command

Coördinates are not exact, i can't find it back.
-> /fill 403 125 677 340 115 750 minecraft:wheat

If someone knows how i can get my world back to normal, please let me know.