MCreator issue tracker has been migrated to GitHub.
Existing tickets have been migrated to GitHub. Please open new tickets on the GitHub tracker instead. If you do not have a GitHub account, all feature requests and bug reports from forums are still considered and checked by the maintainers.
This happens because you call 1000000 times the same block. This blocks the threads of Minecraft and it hangs itself. You could just deal 100000 damage with one call to the Deal damage block.