It seems there is a bug or crash during logging in a realm, I have already downloaded the game all over again and tried to fix the problem on my own but nothing happens and nothing works either. 
this is the error report

1. 1. 1. A fatal error has been detected by the Java Runtime Environment:##  EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x00007ffce81ce92d, pid=3664, tid=3608## JRE version: Java(TM) SE Runtime Environment (8.0_51-b16) (build 1.8.0_51-b16)# Java VM: Java HotSpot(TM) 64-Bit Server VM (25.51-b03 mixed mode windows-amd64 compressed oops)# Problematic frame:# C  [lwjgl_opengl.dll+0xe92d]## Failed to write core dump. Minidumps are not enabled by default on client versions of Windows## If you would like to submit a bug report, please visit:#   http://bugreport.java.com/bugreport/crash.jsp# The crash happened outside the Java Virtual Machine in native code.# See problematic frame for where to report the bug.#
         ---------------  T H R E A D  ---------------
         Current thread (0x000000001d7da800):  JavaThread "Realms-connect-task" [_thread_in_native, id=3608, stack(0x000000002aad0000,0x000000002abd0000)]
         siginfo: ExceptionCode=0xc0000005, reading address 0x00000000000001c0
         Registers:RAX=0x0000000052850d50, RBX=0x0000000000000f0e, RCX=0x0000000000000de1, RDX=0x0000000000000005RSP=0x000000002abce978, RBP=0x000000002abce9e0, RSI=0x0000000000000118, RDI=0x0000000000000d7bR8 =0x0000000000000de1, R9 =0x0000000000000005, R10=0x0000000000000000, R11=0x0000000000000270R12=0x0000000000000000, R13=0x000000002abcea48, R14=0x000000002abce9d0, R15=0x000000001d7da800RIP=0x00007ffce81ce92d, EFLAGS=0x0000000000010246
         Top of Stack: (sp=0x000000002abce978)0x000000002abce978:   0000000003ac198a 000000002abcea900x000000002abce988:   0000000003a36814 000000002abce9f00x000000002abce998:   0000000052180950 000000002abce9a00x000000002abce9a8:   0000000025bef238 000000002abce9f00x000000002abce9b8:   0000000025bf16f0 00000000000000000x000000002abce9c8:   0000000025bef250 000000008601c8d00x000000002abce9d8:   00000000028f7730 000000002abcea900x000000002abce9e8:   0000000003ac1e3c 00000000000000010x000000002abce9f8:   00000000878a4058 0000000086cde2c00x000000002abcea08:   000000002abcea48 00000000274ab6380x000000002abcea18:   0000000000000000 000000002abcea900x000000002abcea28:   00000000028f7a70 000000002abcea900x000000002abcea38:   00000000028f7ced 00000000028f7ced0x000000002abcea48:   0000000086cde2a0 000000002abcea500x000000002abcea58:   00000000274c4efd 000000002abceac80x000000002abcea68:   00000000274c5188 0000000000000000 
         Instructions: (pc=0x00007ffce81ce92d)0x00007ffce81ce90d:   60 cc cc 48 8b 01 41 8b c8 48 8b 50 18 48 ff 620x00007ffce81ce91d:   78 cc cc 48 8b 01 41 8b d1 41 8b c8 4c 8b 50 180x00007ffce81ce92d:   49 ff a2 c0 01 00 00 cc cc cc cc cc cc cc cc cc0x00007ffce81ce93d:   cc cc cc 48 8b 01 41 8b d1 f3 0f 10 44 24 40 41 

Register to memory mapping:
RAX=0x0000000052850d50 is an unknown valueRBX=0x0000000000000f0e is an unknown valueRCX=0x0000000000000de1 is an unknown valueRDX=0x0000000000000005 is an unknown valueRSP=0x000000002abce978 is pointing into the stack for thread: 0x000000001d7da800RBP=0x000000002abce9e0 is pointing into the stack for thread: 0x000000001d7da800RSI=0x0000000000000118 is an unknown valueRDI=0x0000000000000d7b is an unknown valueR8 =0x0000000000000de1 is an unknown valueR9 =0x0000000000000005 is an unknown valueR10=0x0000000000000000 is an unknown valueR11=0x0000000000000270 is an unknown valueR12=0x0000000000000000 is an unknown valueR13=0x000000002abcea48 is pointing into the stack for thread: 0x000000001d7da800R14=0x000000002abce9d0 is pointing into the stack for thread: 0x000000001d7da800R15=0x000000001d7da800 is a thread

Stack: [0x000000002aad0000,0x000000002abd0000],  sp=0x000000002abce978,  free space=1018kNative frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)C  [lwjgl_opengl.dll+0xe92d]
Java frames: (J=compiled Java code, j=interpreted, Vv=VM code)J 6351  org.lwjgl.opengl.GL11.glBindTexture(II)V (0 bytes) @ 0x0000000003ac1904 [0x0000000003ac18c0+0x44]J 6350 C1 dde.h()V (10 bytes) @ 0x0000000003ac1e3c [0x0000000003ac1c60+0x1dc]j  chw.a(Lchx;)Lchy;+29j  chv.a(Lchx;)Lchy;+31j  chv.b(C)Lcia;+61J 6414 C2 chv.a(C)Lcia; (76 bytes) @ 0x0000000003af892c [0x0000000003af87a0+0x18c]J 6323 C1 cfz.a(C)F (27 bytes) @ 0x0000000003ab0bac [0x0000000003ab0ae0+0xcc]j  cfz.e(Ljava/lang/String;I)I+161j  cfz.d(Ljava/lang/String;I)Ljava/lang/String;+14j  cfz.c(Ljava/lang/String;I)Ljava/util/List;+3j  cio.a(Ljava/lang/String;I)Ljava/util/List;+6j  net.minecraft.realms.RealmsScreen.fontSplit(Ljava/lang/String;I)Ljava/util/List;+6j  net.minecraft.realms.DisconnectedRealmsScreen.init()V+25j  cio.c()V+4j  cjs.a(Lcfi;II)V+50j  cio.a(Lcfi;II)V+14j  cfi.a(Lcjs;)V+129j  net.minecraft.realms.Realms.setScreen(Lnet/minecraft/realms/RealmsScreen;)V+7j  net.minecraft.realms.RealmsConnect$1.run()V+374v  ~StubRoutines::call_stub