On my realm whenever I push a wooden button it crashes my game. It does not do this with stone buttons.

Below is the crash report for 1.9.2 but I can post one for 1.9.4 if you so wish

---- Minecraft Crash Report ----
// On the bright side, I bought you a teddy bear!

Time: 18/04/16 16:03
Description: Rendering screen

java.lang.NullPointerException: Rendering screen
at bey.d_(SourceFile:437)
at bdw.d_(SourceFile:87)
at bey.c(SourceFile:433)
at bdw.c(SourceFile:77)
at net.minecraft.realms.RealmsScreen.renderBackground(SourceFile:82)
at com.mojang.realmsclient.gui.screens.RealmsLongRunningMcoTaskScreen.render(RealmsLongRunningMcoTaskScreen.java:80)
at bdw.a(SourceFile:92)
at bnd.a(EntityRenderer.java:1398)
at bcc.av(SourceFile:985)
at bcc.a(SourceFile:392)
at net.minecraft.client.main.Main.main(SourceFile:124)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:131)
at net.minecraft.launchwrapper.Launch.main(Launch.java:27)

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

– Head –
Stacktrace:
at bey.d_(SourceFile:437)
at bdw.d_(SourceFile:87)
at bey.c(SourceFile:433)
at bdw.c(SourceFile:77)
at net.minecraft.realms.RealmsScreen.renderBackground(SourceFile:82)
at com.mojang.realmsclient.gui.screens.RealmsLongRunningMcoTaskScreen.render(RealmsLongRunningMcoTaskScreen.java:80)
at bdw.a(SourceFile:92)

– Screen render details –
Details:
Screen name: bdw
Mouse location: Scaled: (289, 337). Absolute: (578, 30)
Screen size: Scaled: (683, 353). Absolute: (1366, 705). Scale factor of 2
Stacktrace:
at bnd.a(EntityRenderer.java:1398)
at bcc.av(SourceFile:985)
at bcc.a(SourceFile:392)
at net.minecraft.client.main.Main.main(SourceFile:124)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:131)
at net.minecraft.launchwrapper.Launch.main(Launch.java:27)

– System Details –
Details:
Minecraft Version: 1.9.2
Operating System: Windows 8.1 (amd64) version 6.3
Java Version: 1.8.0_31, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 109123024 bytes (104 MB) / 234164224 bytes (223 MB) up to 3207856128 bytes (3059 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx3G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
Launched Version: 1.9.2-OptiFine_HD_U_B1
LWJGL: 2.9.4
OpenGL: GeForce GT 330M/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: No
Is Modded: Very likely; Jar signature invalidated
Type: Client (map_client.txt)
Resource Packs:
Current Language: English (UK)
Profiler Position: N/A (disabled)
CPU: 8x Intel(R) Core(TM) i7 CPU Q 740 @ 1.73GHz
OptiFine Version: OptiFine_1.9.2_HD_U_B1
Render Distance Chunks: 32
Mipmaps: 4
Anisotropic Filtering: 1
Antialiasing: 0
Multitexture: false
Shaders: null
OpenGlVersion: 3.3.0
OpenGlRenderer: GeForce GT 330M/PCIe/SSE2
OpenGlVendor: NVIDIA Corporation
CpuCount: 8