Crash when dragging Emeralds from Villager trading into inventory...or something like that

---- Minecraft Crash Report ----
// Hey, that tickles! Hehehe!

Time: 11/8/15 7:40 PM
Description: Updating screen events

java.lang.ClassCastException: abn cannot be cast to bfq$b
	at bfq.a(SourceFile:180)
	at bfh.b(SourceFile:448)
	at bfq.b(SourceFile:436)
	at bep.k(SourceFile:410)
	at bfq.k(SourceFile:518)
	at bep.p(SourceFile:381)
	at bbz.s(SourceFile:1556)
	at bbz.as(SourceFile:941)
	at bbz.a(SourceFile:385)
	at net.minecraft.client.main.Main.main(SourceFile:125)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Stacktrace:
	at bfq.a(SourceFile:180)
	at bfh.b(SourceFile:448)
	at bfq.b(SourceFile:436)
	at bep.k(SourceFile:410)
	at bfq.k(SourceFile:518)
	at bep.p(SourceFile:381)

-- Affected screen --
Details:
	Screen name: bfq

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bmf['Coolcam6578'/9856, l='MpServer', x=-228.55, y=5.00, z=191.48]]
	Chunk stats: MultiplayerChunkCache: 439, 439
	Level seed: 0
	Level generator: ID 01 - flat, ver 0. Features enabled: false
	Level generator options: 
	Level spawn location: World: (-183,4,302), Chunk: (at 9,0,14 in -12,18; contains blocks -192,0,288 to -177,255,303), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Level time: 9184 game time, 9184 day time
	Level dimension: 0
	Level storage version: 0x00000 - Unknown?
	Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
	Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: false
	Forced entities: 57 total; [vz['Rabbit'/136523, l='MpServer', x=-156.84, y=4.00, z=207.28], vz['Rabbit'/136526, l='MpServer', x=-154.66, y=4.00, z=201.34], vz['Rabbit'/136524, l='MpServer', x=-154.66, y=4.00, z=203.34], vz['Rabbit'/136525, l='MpServer', x=-154.66, y=4.00, z=200.34], vt['Chicken'/136542, l='MpServer', x=-299.50, y=4.00, z=142.50], vt['Chicken'/136543, l='MpServer', x=-303.50, y=4.00, z=144.53], vt['Chicken'/136540, l='MpServer', x=-301.50, y=4.00, z=144.50], vt['Chicken'/136541, l='MpServer', x=-305.34, y=4.00, z=144.47], vz['Rabbit'/136547, l='MpServer', x=-305.72, y=4.00, z=144.31], vz['Rabbit'/136545, l='MpServer', x=-308.50, y=4.00, z=147.50], vz['Rabbit'/136548, l='MpServer', x=-306.66, y=4.00, z=143.34], vz['Rabbit'/136549, l='MpServer', x=-304.66, y=4.00, z=143.34], wa['Sheep'/136555, l='MpServer', x=-263.97, y=4.00, z=177.69], zj['Villager'/9836, l='MpServer', x=-261.44, y=4.00, z=196.56], vz['Rabbit'/136558, l='MpServer', x=-258.22, y=4.00, z=165.22], zj['Villager'/9837, l='MpServer', x=-251.31, y=5.00, z=194.22], zj['Villager'/9838, l='MpServer', x=-228.66, y=4.00, z=202.34], wa['Sheep'/136556, l='MpServer', x=-248.59, y=4.00, z=157.09], zj['Villager'/9839, l='MpServer', x=-230.03, y=5.00, z=204.63], wa['Sheep'/136557, l='MpServer', x=-264.91, y=4.00, z=175.69], zj['Villager'/9840, l='MpServer', x=-242.72, y=5.00, z=198.47], zj['Villager'/9841, l='MpServer', x=-235.72, y=5.00, z=231.50], vz['Rabbit'/136563, l='MpServer', x=-173.50, y=4.00, z=146.50], zj['Villager'/9842, l='MpServer', x=-239.56, y=5.00, z=235.47], zj['Villager'/9843, l='MpServer', x=-230.28, y=5.22, z=206.47], zj['Villager'/9844, l='MpServer', x=-209.56, y=5.00, z=195.28], vz['Rabbit'/136566, l='MpServer', x=-172.66, y=4.00, z=151.34], zj['Villager'/9845, l='MpServer', x=-235.44, y=4.00, z=206.56], vz['Rabbit'/136567, l='MpServer', x=-277.41, y=4.00, z=244.03], zj['Villager'/9846, l='MpServer', x=-217.53, y=5.00, z=168.59], vz['Rabbit'/136564, l='MpServer', x=-169.31, y=4.00, z=146.44], zj['Villager'/9847, l='MpServer', x=-228.13, y=5.00, z=189.53], vz['Rabbit'/136565, l='MpServer', x=-176.66, y=4.00, z=150.34], zj['Villager'/9848, l='MpServer', x=-227.66, y=5.00, z=191.47], vz['Rabbit'/136570, l='MpServer', x=-281.31, y=4.00, z=238.56], zj['Villager'/9849, l='MpServer', x=-205.38, y=6.00, z=180.47], zj['Villager'/9850, l='MpServer', x=-220.78, y=5.16, z=179.44], vz['Rabbit'/136568, l='MpServer', x=-271.78, y=4.00, z=240.31], zj['Villager'/9851, l='MpServer', x=-219.88, y=4.00, z=229.47], vz['Rabbit'/136569, l='MpServer', x=-270.53, y=4.00, z=230.69], zj['Villager'/9852, l='MpServer', x=-235.78, y=5.00, z=195.28], zj['Villager'/9853, l='MpServer', x=-217.16, y=6.00, z=196.50], zj['Villager'/9854, l='MpServer', x=-217.53, y=5.00, z=227.69], zj['Villager'/9855, l='MpServer', x=-217.53, y=5.00, z=227.28], wa['Sheep'/136579, l='MpServer', x=-261.13, y=4.00, z=184.06], wa['Sheep'/136582, l='MpServer', x=-253.75, y=4.00, z=187.72], wg['Horse'/136583, l='MpServer', x=-212.09, y=4.00, z=141.53], wa['Sheep'/136580, l='MpServer', x=-268.91, y=4.00, z=189.28], wa['Sheep'/136581, l='MpServer', x=-249.88, y=4.00, z=175.00], wg['Horse'/136586, l='MpServer', x=-206.13, y=4.00, z=140.25], vt['Chicken'/136587, l='MpServer', x=-219.56, y=4.00, z=149.63], wg['Horse'/136584, l='MpServer', x=-240.41, y=4.00, z=159.97], wg['Horse'/136585, l='MpServer', x=-218.28, y=4.00, z=144.09], wa['Sheep'/136590, l='MpServer', x=-285.75, y=4.00, z=115.88], wa['Sheep'/136591, l='MpServer', x=-294.44, y=4.00, z=118.81], wa['Sheep'/136589, l='MpServer', x=-295.56, y=4.00, z=118.03], bmf['Coolcam6578'/9856, l='MpServer', x=-228.55, y=5.00, z=191.48]]
	Retry entities: 0 total; []
	Server brand: vanilla
	Server type: Integrated singleplayer server
Stacktrace:
	at bkg.a(SourceFile:363)
	at bbz.b(SourceFile:2496)
	at bbz.a(SourceFile:394)
	at net.minecraft.client.main.Main.main(SourceFile:125)

-- System Details --
Details:
	Minecraft Version: 15w45a
	Operating System: Windows Vista (x86) version 6.0
	Java Version: 1.8.0_65, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
	Memory: 250743272 bytes (239 MB) / 487243776 bytes (464 MB) up to 523501568 bytes (499 MB)
	JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
	IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 94
	Launched Version: 15w45a
	LWJGL: 2.9.4
	OpenGL: GeForce 9500 GT/PCIe/SSE2 GL version 3.3.0, NVIDIA Corporation
	GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Shaders are available because OpenGL 2.1 is supported.
VBOs are available because OpenGL 1.5 is supported.

	Using VBOs: Yes
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Packs: 
	Current Language: English (US)
	Profiler Position: N/A (disabled)
	CPU: 2x Intel(R) Core(TM)2 CPU 4300 @ 1.80GHz