The server has crashing when i hit a ender crystal with a snowball or arrow.
The error message :
Sorry for my bad english
Can you post the actual crash report file on Pastebin or attach it here as file? (As your screenshot suggest it was written to the crash-report directory)
Thank you for your report! Please try SpongeVanilla 1.8.9-3.1.0-BETA-205 from https://repo.spongepowered.org/maven/org/spongepowered/spongevanilla/, this should be fixed now.