This issue was marked as a duplicate and closed multiple times by Nedelosk (in #636 , #626 , and #628 ) with nothing being done about it, despite it causing crashes on 1.12.2 servers. Clearly this is still an issue as of March 18.

Here is the error report
`Time: 3/18/20 10:20 PM
Description: Exception ticking world

java.lang.NullPointerException: Exception ticking world
at forestry.arboriculture.genetics.TreeGrowthHelper.hasSufficientSaplingsAroundSapling(TreeGrowthHelper.java:65)
at forestry.arboriculture.genetics.TreeGrowthHelper.canGrow(TreeGrowthHelper.java:20)
at forestry.arboriculture.genetics.Tree.canGrow(Tree.java:167)
at binnie.extratrees.gen.BinnieWorldGenTree.canGrow(BinnieWorldGenTree.java:62)
at binnie.extratrees.gen.BinnieWorldGenTree.generate(BinnieWorldGenTree.java:115)
at forestry.arboriculture.tiles.TileSapling.tryGrow(TileSapling.java:99)
at forestry.arboriculture.tiles.TileSapling.onBlockTick(TileSapling.java:50)
at forestry.arboriculture.blocks.BlockTreeContainer.func_180650_b(BlockTreeContainer.java:44)
at net.minecraft.block.Block.func_180645_a(Block.java:508)
at net.minecraft.world.WorldServer.func_147456_g(WorldServer.java:476)
at net.minecraft.world.WorldServer.func_72835_b(WorldServer.java:225)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:756)
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:397)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:668)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:526)
at java.lang.Thread.run(Unknown Source)`

and here is the stacktrace.
Stacktrace: at forestry.arboriculture.genetics.TreeGrowthHelper.hasSufficientSaplingsAroundSapling(TreeGrowthHelper.java:65) at forestry.arboriculture.genetics.TreeGrowthHelper.canGrow(TreeGrowthHelper.java:20) at forestry.arboriculture.genetics.Tree.canGrow(Tree.java:167) at binnie.extratrees.gen.BinnieWorldGenTree.canGrow(BinnieWorldGenTree.java:62) at binnie.extratrees.gen.BinnieWorldGenTree.generate(BinnieWorldGenTree.java:115) at forestry.arboriculture.tiles.TileSapling.tryGrow(TileSapling.java:99) at forestry.arboriculture.tiles.TileSapling.onBlockTick(TileSapling.java:50) at forestry.arboriculture.blocks.BlockTreeContainer.func_180650_b(BlockTreeContainer.java:44) at net.minecraft.block.Block.func_180645_a(Block.java:508) at net.minecraft.world.WorldServer.func_147456_g(WorldServer.java:476) at net.minecraft.world.WorldServer.func_72835_b(WorldServer.java:225)

I am sorry about my closing. I fixed it internally but it seems like I forgot to push the fix to Github.

This should now be fixed. It would be great if you could test it and give me feedback.

I am still having this issue. My server is crashing after a few minutes of playing with an almost identical error log, but different numbers which I am assuming means different tree IDs. I have updated forestry and Binnie mods to the latest versions is there anything else I need to do?

Crash log: https://pastebin.com/Tg2F8i2q

@Nedelosk @nstearns96
Unfortunately, after a bit of testing, it seems that I got the same crash log again. I updated my Binnie mods (202) and forestry (418) I was able to play for about an hour before the server crashed. Before this fix, I was only able to stay on for around 5 minutes before a crash occurred.

Crash log: https://pastebin.com/dU5aN2my

Can you tell me anything about the saplings? did you place them yourself? are they naturally generated (meaning you didn't place any but you're crashing) etc

Nvm, I've found the bug

Thanks for replying so quickly. Hopefully this works!

@Nedelosk I'm still getting this as well, but I have a fix for it. Pull request should be up sometime today.