every time I try to feed a hedgehog it crashes and says this

The game crashed whilst unexpected error
Error: java.lang.NullPointerException: Unexpected error

In addition to what lottielu said, I'm having problems when I feed ferrets as well as hedgehogs any food. Haven't tried hamsters yet

my mod list is advanced rocketry, carry on, mr cray fish furniture mod, craft studio, just enough items, journey map, Libvulpes, llibray, Minecraft comes alive, optiFine, ANNND radix core, im also using 1.12.2 and im feeding it carrots I dont know if it happens to the others I haven't tried

ok so I dont know if this is all of the code but this is what I found on the crash report also it happens with all the food types

error
at com.animania.common.entities.rodents.EntityHedgehogBase.func_175505_a(EntityHedgehogBase.java:198)
at com.animania.common.entities.rodents.EntityHedgehogBase.func_184645_a(EntityHedgehogBase.java:495)
at net.minecraft.entity.EntityLiving.func_184230_a(EntityLiving.java:1414)
at net.minecraft.entity.player.EntityPlayer.func_190775_a(EntityPlayer.java:1199)
at net.minecraft.client.multiplayer.PlayerControllerMP.func_187097_a(PlayerControllerMP.java:549)
at net.optifine.override.PlayerControllerOF.func_187097_a(PlayerControllerOF.java:111)
at net.minecraft.client.Minecraft.func_147121_ag(Minecraft.java:1566)
at net.minecraft.client.Minecraft.func_184117_aA(Minecraft.java:2253)
at net.minecraft.client.Minecraft.func_184118_az(Minecraft.java:2019)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1807)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:1097)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:397)
at net.minecraft.client.main.Main.main(SourceFile:123)
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:497)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

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

-- Head --
Thread: Client thread
Stacktrace:
at com.animania.common.entities.rodents.EntityHedgehogBase.func_175505_a(EntityHedgehogBase.java:198)
at com.animania.common.entities.rodents.EntityHedgehogBase.func_184645_a(EntityHedgehogBase.java:495)
at net.minecraft.entity.EntityLiving.func_184230_a(EntityLiving.java:1414)
at net.minecraft.entity.player.EntityPlayer.func_190775_a(EntityPlayer.java:1199)
at net.minecraft.client.multiplayer.PlayerControllerMP.func_187097_a(PlayerControllerMP.java:549)
at net.optifine.override.PlayerControllerOF.func_187097_a(PlayerControllerOF.java:111)
at net.minecraft.client.Minecraft.func_147121_ag(Minecraft.java:1566)
at net.minecraft.client.Minecraft.func_184117_aA(Minecraft.java:2253)
at net.minecraft.client.Minecraft.func_184118_az(Minecraft.java:2019)

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [EntityPlayerSP['aworldintime'/96, l='MpServer', x=133.93, y=73.00, z=1567.10]]
Chunk stats: MultiplayerChunkCache: 287, 287
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (138,64,194), Chunk: (at 10,4,2 in 8,12; contains blocks 128,0,192 to 143,255,207), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 33908 game time, 33908 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: 55 total; [EntitySpider['Spider'/256, l='MpServer', x=128.60, y=30.00, z=1578.60], EntitySkeleton['Skeleton'/257, l='MpServer', x=128.50, y=30.00, z=1580.50], EntityBat['Bat'/258, l='MpServer', x=134.61, y=29.10, z=1577.45], EntitySkeleton['Skeleton'/259, l='MpServer', x=138.11, y=27.00, z=1578.50], EntitySkeleton['Skeleton'/260, l='MpServer', x=137.49, y=27.00, z=1579.28], EntitySpider['Spider'/261, l='MpServer', x=136.00, y=27.00, z=1571.96], EntitySkeleton['Skeleton'/263, l='MpServer', x=135.09, y=30.00, z=1579.77], EntitySpider['Spider'/264, l='MpServer', x=131.70, y=32.10, z=1579.70], EntityCreeper['Creeper'/266, l='MpServer', x=135.19, y=27.00, z=1580.60], EntityCreeper['Creeper'/267, l='MpServer', x=138.70, y=27.00, z=1577.64], EntityBat['Bat'/268, l='MpServer', x=127.25, y=27.33, z=1572.54], EntityBat['Bat'/269, l='MpServer', x=135.58, y=29.00, z=1579.74], EntityBat['Bat'/270, l='MpServer', x=134.54, y=33.10, z=1578.25], EntityHedgehogAlbino['Albino Hedgehog'/398, l='MpServer', x=178.25, y=66.00, z=1614.75], EntityCreeper['Creeper'/271, l='MpServer', x=131.50, y=35.00, z=1577.50], EntityWagon['Covered Wagon'/399, l='MpServer', x=144.32, y=71.00, z=1593.34], EntityRoosterLeghorn['Leghorn Rooster'/400, l='MpServer', x=169.43, y=71.00, z=1586.12], EntityBat['Bat'/273, l='MpServer', x=136.38, y=33.10, z=1578.66], EntityZombie['Zombie'/274, l='MpServer', x=139.32, y=35.00, z=1576.52], EntitySkeleton['Skeleton'/275, l='MpServer', x=137.64, y=35.00, z=1575.50], EntityMareDraftHorse['Draft Horse Mare'/404, l='MpServer', x=132.96, y=73.00, z=1580.24], EntityMinecartChest['Minecart with Chest'/405, l='MpServer', x=158.50, y=25.06, z=1557.50], EntityHenLeghorn['Leghorn Hen'/408, l='MpServer', x=129.36, y=70.00, z=1615.53], EntitySpider['Spider'/410, l='MpServer', x=139.54, y=31.00, z=1585.30], EntityHenLeghorn['Leghorn Hen'/415, l='MpServer', x=168.38, y=69.00, z=1527.49], EntityMinecartChest['Minecart with Chest'/416, l='MpServer', x=165.50, y=24.00, z=1530.49], EntityMinecartChest['Minecart with Chest'/417, l='MpServer', x=143.50, y=30.06, z=1500.50], EntityCreeper['Creeper'/1058, l='MpServer', x=146.50, y=25.00, z=1556.50], EntityCreeper['Creeper'/1059, l='MpServer', x=142.50, y=25.00, z=1557.50], EntitySowYorkshire['American Yorkshire Sow'/421, l='MpServer', x=135.04, y=71.00, z=1528.82], EntityPlayerSP['aworldintime'/96, l='MpServer', x=133.93, y=73.00, z=1567.10], EntityFrogs['Frog'/328, l='MpServer', x=92.50, y=63.00, z=1620.50], EntityMinecartChest['Minecart with Chest'/330, l='MpServer', x=123.50, y=26.06, z=1556.50], EntityMinecartChest['Minecart with Chest'/331, l='MpServer', x=123.50, y=26.06, z=1561.50], EntityBat['Bat'/333, l='MpServer', x=127.25, y=26.29, z=1559.55], EntitySkeleton['Skeleton'/334, l='MpServer', x=134.38, y=27.00, z=1579.85], EntityBat['Bat'/336, l='MpServer', x=127.25, y=27.10, z=1570.13], EntitySkeleton['Skeleton'/464, l='MpServer', x=126.50, y=14.00, z=1558.50], EntityCreeper['Creeper'/337, l='MpServer', x=118.50, y=35.00, z=1575.50], EntityMinecartChest['Minecart with Chest'/339, l='MpServer', x=122.50, y=30.06, z=1551.50], EntityRoosterLeghorn['Leghorn Rooster'/340, l='MpServer', x=115.64, y=71.00, z=1547.46], EntityZombie['Zombie'/341, l='MpServer', x=83.74, y=57.00, z=1504.48], EntityMinecartChest['Minecart with Chest'/342, l='MpServer', x=102.50, y=35.06, z=1500.50], EntityZombie['Zombie'/343, l='MpServer', x=126.50, y=50.00, z=1510.50], EntityCreeper['Creeper'/344, l='MpServer', x=121.50, y=50.00, z=1515.50], EntityMinecartChest['Minecart with Chest'/345, l='MpServer', x=71.50, y=31.06, z=1490.50], EntityMinecartChest['Minecart with Chest'/346, l='MpServer', x=78.50, y=31.06, z=1498.50], EntitySowYorkshire['American Yorkshire Sow'/348, l='MpServer', x=78.00, y=97.00, z=1519.86], EntityMinecartChest['Minecart with Chest'/349, l='MpServer', x=92.50, y=31.06, z=1500.50], EntityMinecartChest['Minecart with Chest'/350, l='MpServer', x=84.50, y=35.06, z=1489.50], EntitySkeleton['Skeleton'/248, l='MpServer', x=137.50, y=25.00, z=1565.50], EntitySkeleton['Skeleton'/249, l='MpServer', x=137.50, y=25.00, z=1567.50], EntityBat['Bat'/252, l='MpServer', x=145.47, y=26.02, z=1566.13], EntityHedgehog['Hedgehog'/253, l='MpServer', x=132.52, y=73.00, z=1566.44], EntitySkeleton['Skeleton'/255, l='MpServer', x=131.70, y=27.00, z=1574.49]]
Retry entities: 0 total; []
Server brand: fml,forge
Server type: Integrated singleplayer server
Stacktrace:
at net.minecraft.client.multiplayer.WorldClient.func_72914_a(WorldClient.java:532)
at net.minecraft.client.Minecraft.func_71396_d(Minecraft.java:2740)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:426)
at net.minecraft.client.main.Main.main(SourceFile:123)
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:497)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

-- System Details --
Details:
Minecraft Version: 1.12.2
Operating System: Windows 10 (amd64) version 10.0
Java Version: 1.8.0_51, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 535467608 bytes (510 MB) / 1207959552 bytes (1152 MB) up to 2147483648 bytes (2048 MB)
JVM Flags: 8 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx2G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M
IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
FML: MCP 9.42 Powered by Forge 14.23.5.2768 Optifine OptiFine_1.12.2_HD_U_E2 16 mods loaded, 16 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored

| State     | ID                   | Version      | Source                                          | Signature                                |
|:--------- |:-------------------- |:------------ |:----------------------------------------------- |:---------------------------------------- |
| UCHIJAAAA | minecraft            | 1.12.2       | minecraft.jar                                   | None                                     |
| UCHIJAAAA | mcp                  | 9.42         | minecraft.jar                                   | None                                     |
| UCHIJAAAA | FML                  | 8.0.99.99    | forge-1.12.2-14.23.5.2768.jar                   | e3c3d50c7c986df74c645c0ac54639741c90a557 |
| UCHIJAAAA | forge                | 14.23.5.2768 | forge-1.12.2-14.23.5.2768.jar                   | e3c3d50c7c986df74c645c0ac54639741c90a557 |
| UCHIJAAAA | advancedrocketrycore | 1            | minecraft.jar                                   | None                                     |
| UCHIJAAAA | libvulpes            | 0.3.0.-44    | LibVulpes-1.12.2-0.3.0-44-universal.jar         | None                                     |
| UCHIJAAAA | advancedrocketry     | 1.4.1.-111   | AdvancedRocketry-1.12.2-1.4.1-111-universal.jar | None                                     |
| UCHIJAAAA | craftstudioapi       | 1.0.0        | CraftStudio-1.0.0.93-mc1.12-alpha.jar           | None                                     |
| UCHIJAAAA | animania             | 1.6.1        | animania-1.12.2-1.6.1.jar                       | None                                     |
| UCHIJAAAA | carryon              | 1.11.1       | CarryOn+MC1.12.2+v1.11.1.jar                    | None                                     |
| UCHIJAAAA | cfm                  | 5.12.0       | cfm-5.12.0-mc1.12.2.jar                         | None                                     |
| UCHIJAAAA | jei                  | 4.13.0.218   | jei_1.12.2-4.13.0.218.jar                       | None                                     |
| UCHIJAAAA | journeymap           | 1.12.2-5.5.2 | journeymap-1.12.2-5.5.2 (2).jar                 | None                                     |
| UCHIJAAAA | radixcore            | 1.12.x-2.2.1 | RadixCore-1.12.x-2.2.1-universal.jar            | None                                     |
| UCHIJAAAA | mca                  | 1.12.2-5.3.1 | MCA-1.12.x-5.3.1-universal.jar                  | None                                     |
| UCHIJAAAA | llibrary             | 1.7.15       | llibrary-1.7.15-1.12.2.jar                      | b9f30a813bee3b9dd5652c460310cfcd54f6b7ec |

Loaded coremods (and transformers): 

AdvancedRocketryPlugin (AdvancedRocketry-1.12.2-1.4.1-111-universal.jar)
zmaster587.advancedRocketry.asm.ClassTransformer
llibrary (llibrary-core-1.0.8-1.12.2.jar)
net.ilexiconn.llibrary.server.core.plugin.LLibraryTransformer
net.ilexiconn.llibrary.server.core.patcher.LLibraryRuntimePatcher
GL info: ' Vendor: 'Intel' Version: '4.4.0 - Build 20.19.15.4642' Renderer: 'Intel(R) HD Graphics 405'
Launched Version: 1.12.2-forge1.12.2-14.23.5.2768
LWJGL: 2.9.4
OpenGL: Intel(R) HD Graphics 405 GL version 4.4.0 - Build 20.19.15.4642, Intel
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: Definitely; Client brand changed to 'fml,forge'
Type: Client (map_client.txt)
Resource Packs: Clear+Glass+Pack+1.11+or+1.12.zip
Current Language: English (US)
Profiler Position: N/A (disabled)
CPU: 4x Intel(R) Pentium(R) CPU N3710 @ 1.60GHz
OptiFine Version: OptiFine_1.12.2_HD_U_E2
OptiFine Build: 20180728-185429
Render Distance Chunks: 8
Mipmaps: 4
Anisotropic Filtering: 1
Antialiasing: 0
Multitexture: false
Shaders: null
OpenGlVersion: 4.4.0 - Build 20.19.15.4642
OpenGlRenderer: Intel(R) HD Graphics 405
OpenGlVendor: Intel
CpuCount: 4

so turns out that it was just the 1.6.1 version so you might wanna get that fixed

What are you feeding it with? What is your modlist? Can you post the entire crash? What is your version?

_{Sent with GitHawk}

also crashes with ferrets when feeding them eggs

I am looking into it.