I've been migrating my base to a new sky island and while flying back and forth I've gotten a few crashes that look to be botania related. I'm guessing it's chunk load/unload related.

java.lang.NullPointerException: Ticking block entity
at vazkii.botania.common.block.tile.mana.TilePool.recieveMana(TilePool.java:125)
http://pastebin.com/kjY4Jwmz
http://pastebin.com/pVusb6eb

java.lang.NullPointerException: Ticking block entity
at vazkii.botania.common.block.tile.mana.TilePool.isFull(TilePool.java:118)
http://pastebin.com/1ux9aW32
http://pastebin.com/uPFfzL3E

java.lang.NullPointerException: Ticking block entity
at mcmultipart.capabilities.MultipartCapabilityHelper.hasCapability(MultipartCapabilityHelper.java:22)
at mcmultipart.block.TileMultipart.hasCapability(TileMultipart.java:120)
at vazkii.botania.common.core.helper.InventoryHelper2.getInventory(InventoryHelper2.java:28)
http://pastebin.com/kiiYGXeG

the frist two I have tentative fixes for, the third i think is a mcmultipart bug, try updating it to the most recent

Cool. I was getting the first two while air dashing towards the area with the flugal tiara's special ability.
I'll grab that mcmultipart update (sorry, didn't realize I was behind again) and if I can get the the crash to pop up again I'll report it over there.

java.lang.NullPointerException: Ticking block entity
at vazkii.botania.common.block.tile.mana.TilePool.isFull(TilePool.java:118)
http://pastebin.com/1ux9aW32
http://pastebin.com/uPFfzL3E

FWIW, I can confirm this one with v0.6.4.2. Whenever the next version is out I'll bug the server owner to update.

I have also encountered the first crash several times, where the block receiving mana from the mana pool has been a Mana Spreader and several different functional flowers. I can reliably reproduce the crash by teleporting to an area (via Thaumic Infusion teleports) that has these kinds of setups, but merely logging in at that area does not crash.

I have the same issue on my friends server any time i go out of or into a chunk with mana spreaders and other flowers, I crash in the same way each time with a different generation flower or functional flower as the root it seems, its rather frustrating cant even play like this ive had like 40 crashes over the last 3 days
this time it was my exoflames before this crash it was the agracarnations

Description: Ticking block entity

java.lang.NullPointerException: Ticking block entity
at vazkii.botania.common.block.tile.mana.TilePool.recieveMana(TilePool.java:125)
at vazkii.botania.api.subtile.SubTileFunctional.onUpdate(SubTileFunctional.java:69)
at vazkii.botania.common.block.subtile.functional.SubTileExoflame.onUpdate(SubTileExoflame.java:34)
at vazkii.botania.common.block.tile.TileSpecialFlower.updateEntity(TileSpecialFlower.java:97)
at vazkii.botania.common.block.tile.TileMod.func_73660_a(TileMod.java:69)
at net.minecraft.world.World.func_72939_s(World.java:1718)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:2089)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:1024)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:349)
at net.minecraft.client.main.Main.main(SourceFile:124)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

hang in there, new build within the next two days

Thanks for the update, enjoy!

Haven't seen any of these crashes since the latest release, looks like it's fixed to me

Same here.