Crashed because I console command spawned an invalid block in realm

I was going through the flowers spawning stacks of them starting with "/give tesla7 175 64 1" and then "/give tesla7 175 64 2" and so on even though i wasnt sure what that would give me. I just assumed 175 was all of the flowers. i did an invalid spawn at 5 or 6 and it kicked me off and crashed. i havent been able to get on since. This is in my Realm. I noticed other people have been getting on too judging by activity so its just my acct. i really really want to play ASAP. My username is Tesla7 and my Realm is named Tesla.
It says on the crash pop up that if i gave myself an invalid item to revert these actions but i dont know how to do that