java.lang.NullPointerException: Unexpected error

[Kazum4]

when I leave my game in full screen, it crashes and it happens

Here's my crash report:

 

---- Minecraft Crash Report ----
// Hi. I'm Minecraft, and I'm a crashaholic.

Time: 15/05/21 15:20
Description: Unexpected error

java.lang.NullPointerException: Unexpected error
    at wF.a(Unknown Source)
    at ww.a(Unknown Source)
    at ww.a(Unknown Source)
    at net.minecraft.client.c.ae(Unknown Source)
    at net.minecraft.client.c.T(Unknown Source)
    at net.minecraft.client.c.run(Unknown Source)
    at net.minecraft.client.main.Main.main(Unknown Source)

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

-- System Details --
Details:
    Minecraft Version: 1.8.8
    Operating System: Windows 8 (amd64) version 6.2
    CPU: 4x Intel(R) Xeon(R) CPU E3-1225 v3 @ 3.20GHz
    Java Version: 1.8.0_51, Oracle Corporation
    Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
    Memory: 560488960 bytes (534 MB) / 771751936 bytes (736 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: 0, tallocated: 0
    Launched Version: PixelClient
    LWJGL: 2.9.4
    OpenGL: ~~ERROR~~ RuntimeException: No OpenGL context found in the current thread.
    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: §7LovelyJubbly.zip
    Current Language: English (US)
    Profiler Position: N/A (disabled)
    CPU: 4x Intel(R) Xeon(R) CPU E3-1225 v3 @ 3.20GHz