After i have updated the Better Questing for 3.0.297 version, any player of my server who's try use then is disconnect with internal error.
If i are on creative inventory, and try to clean my inventory holding shift is disconnected too.

it's thrown this error on console
[13:13:04] [Server thread/WARN]: Failed to handle packet for /<IP:PORT> java.lang.ClassCastException: bq_standard.handlers.PlayerContainerListener cannot be cast to net.minecraft.entity.player.EntityPlayerMP at net.minecraft.inventory.ContainerPlayer.func_75130_a(ContainerPlayer.java:105) ~[aap.class:?] at net.minecraft.inventory.InventoryCrafting.func_70299_a(InventoryCrafting.java:153) ~[aae.class:?] at net.minecraft.inventory.Slot.func_75215_d(Slot.java:77) ~[aay.class:?] at net.minecraft.inventory.Container.func_75144_a(Container.java:418) ~[zs.class:?] at net.minecraft.network.NetHandlerPlayServer.func_147351_a(NetHandlerPlayServer.java:2075) ~[nh.class:?] at net.minecraft.network.play.client.C0EPacketClickWindow.func_148833_a(SourceFile:32) ~[ix.class:?] at net.minecraft.network.play.client.C0EPacketClickWindow.func_148833_a(SourceFile:10) ~[ix.class:?] at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:245) ~[ej.class:?] at net.minecraft.network.NetworkSystem.func_151269_c(NetworkSystem.java:181) [nc.class:?] at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:1023) [MinecraftServer.class:?] at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:432) [lt.class:?] at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:841) [MinecraftServer.class:?] at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:693) [MinecraftServer.class:?] at java.lang.Thread.run(Thread.java:748) [?:1.8.0_191]

BetterQuesting-3.0.297.jar
StandardExpansion-3.0.155.jar

What version of Forge are you using? I can't recreate this in 1558 and that error points to something that doesn't exist at least in that version.

I'm using forge 1614, and the server is running Thermos 58.

This problem is caused by a thermos patch here
I've created a core mod to fix this problem here
Sorry, my English is not very good.

In that case I can close this issue seeing as this stems from Thermos making unchecked casting (which judging by the comment in code was known unsafe). I won't be rolling BQ's implementation back to 'fix' this either.