I have a problem: Minecraft is crashing with the following message:

07:45:50] [Client thread/FATAL]: Error executing task
java.util.concurrent.ExecutionException: java.lang.NullPointerException
at java.util.concurrent.FutureTask.report(FutureTask.java:122) ~[?:1.8.0_25]
at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[?:1.8.0_25]
at g.a(SourceFile:46) [1.9.jar:?]
at bcf.av(SourceFile:954) [1.9.jar:?]
at bcf.a(SourceFile:392) [1.9.jar:?]
at net.minecraft.client.main.Main.main(SourceFile:124) [1.9.jar:?]
Caused by: java.lang.NullPointerException
at bks.a(SourceFile:452) ~[1.9.jar:?]
at fo.a(SourceFile:68) ~[1.9.jar:?]
at fo.a(SourceFile:15) ~[1.9.jar:?]
at fh$1.run(SourceFile:13) ~[1.9.jar:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_25]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_25]
at g.a(SourceFile:45) ~[1.9.jar:?]
... 3 more
[07:45:51] [Client thread/FATAL]: Error executing task
java.util.concurrent.ExecutionException: java.lang.NullPointerException
at java.util.concurrent.FutureTask.report(FutureTask.java:122) ~[?:1.8.0_25]
at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[?:1.8.0_25]
at g.a(SourceFile:46) [1.9.jar:?]
at bcf.av(SourceFile:954) [1.9.jar:?]
at bcf.a(SourceFile:392) [1.9.jar:?]
at net.minecraft.client.main.Main.main(SourceFile:124) [1.9.jar:?]
Caused by: java.lang.NullPointerException
at bks.a(SourceFile:452) ~[1.9.jar:?]
at fo.a(SourceFile:68) ~[1.9.jar:?]
at fo.a(SourceFile:15) ~[1.9.jar:?]
at fh$1.run(SourceFile:13) ~[1.9.jar:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_25]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_25]
at g.a(SourceFile:45) ~[1.9.jar:?]
... 3 more
#

1. A fatal error has been detected by the Java Runtime Environment:
   #
2. EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x00007ff9c5c66a27, pid=7644, tid=576
   #
3. JRE version: Java(TM) SE Runtime Environment (8.0_25-b18) (build 1.8.0_25-b18)
4. Java VM: Java HotSpot(TM) 64-Bit Server VM (25.25-b02 mixed mode windows-amd64 compressed oops)
5. Problematic frame:
6. C [ig8icd64.dll+0x16a27]
   #
7. Failed to write core dump. Minidumps are not enabled by default on client versions of Windows
   #
8. An error report file with more information is saved as:
9. C:\Users\johan\AppData\Roaming\.minecraft\hs_err_pid7644.log
   #
10. If you would like to submit a bug report, please visit:
11. http://bugreport.sun.com/bugreport/crash.jsp
12. The crash happened outside the Java Virtual Machine in native code.
13. See problematic frame for where to report the bug.
    #
    AL lib: (EE) alc_cleanup: 1 device not closed

What i need to do?