game crashes when you ride a boat on top of an ender crystal
I was expecting to fall trough or float over the crystal entities.
It floated for a bit, then crashed the game
1. Place ender crystals in a row. (i broke the obsidian after placing)
2. place a boat on a block above the crystals
3.hop in the boat
4.row onto the crystals and forward
5.Result/
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Incomplete without a crash report from ([minecraft/crash-reports/crash-<DATE>-client.txt|http://hopper.minecraft.net/help/finding-minecraft-data-folder]
). Please attach it to this ticket so that we can diagnose your issue.

Confirmed for
15w44b
[19:46:41] [Server thread/WARN]: Marcono1234 was kicked for floating a vehicle too long!
[19:46:41] [Server thread/INFO]: Marcono1234 lost connection: TextComponent{text='Flying is not enabled on this server', siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null, insertion=null}}
The problem seems to be that boats float on things they cannot pick up. For example EnderCrystals, AreaEffectClouds, Fireballs...

It seems to only do it when the boat is stationary. Here is a short clip of a boat moving at hyper speed while floating on ender crystals. (riding in the boat while moving does not crash the game) https://www.youtube.com/watch?v=pIDo0A4AsaM

can confirm in 15w45a. dropped boat on to crystal, entered the boat. the first time I got a crash upon exiting the boat, the second crash was while paddling. (I'm using win 7, java x64, gtx 970, 2600k cpu, 8Gb of ram allocated to minecraft)

Confirmed for
15w46a Happens if the boat "flies" on any entity, for example also an ArmorStand

In 16w03a, boats don't move anymore when on endercrystals, so it doesn't crash.