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I tried to replicate the error, but it worked perfectly this time. The dragon died and the poem and credits appeared as normal. I'm deeply sorry for the incovenient, and thanks for your attention.
If for some reason I happen to get this error again, I'll make sure to post it with the log. Thank you again 
I'm currently using Forge and the version 1.14.3. I'm also using VoxelMap mod 
Hi! I'm having an issue with ender dragon,
Every time I kill the ender dragon an Internal error: java.lang.stackoverflowError occurs. If I start the server again, the dragon is still alive but it has low hp. This happens every time the dragon dies, right after the explosion animation.
It also happens if I kill it with the command /kill @e[type=ender_dragon]
