Error when assign material

Unhandled exception occurred:EXCEPTION_ACCESS_VIOLATION (code: 0xC0000005)
0# 0x00007FFD98540559 in VisualComponents_Revolution
1# 0x00007FFD1C93C25E
2# 0x00007FFD1C93B661
3# 0x00007FFD78AA21FE in clr
4# 0x00007FFD1C93B51E
5# 0x00007FFD78AA21FE in clr
6# enableCppUnhandledExceptionDispatcher in VisualComponents_Revolution
7# _chkstk in ntdll
8# RtlRaiseException in ntdll
9# RtlRaiseException in ntdll
10# RaiseException in KERNELBASE
11# 0x00007FFD78AA11E9 in clr
12# 0x00007FFD78AA121B in clr
13# 0x00007FFD9ACEC9E2 in PresentationFramework_ni
14# 0x00007FFD9C1CB0DF in WindowsBase_ni
15# 0x00007FFD9C1B3F28 in WindowsBase_ni
16# 0x00007FFD9C1B3E26 in WindowsBase_ni
17# 0x00007FFD9C1B690C in WindowsBase_ni
18# 0x00007FFD9C1CA9CD in WindowsBase_ni
19# 0x00007FFD7796DF12 in mscorlib_ni
20# 0x00007FFD7796DD95 in mscorlib_ni
21# 0x00007FFD7796DD65 in mscorlib_ni
22# 0x00007FFD9C1B6701 in WindowsBase_ni
23# 0x00007FFD9C1B6502 in WindowsBase_ni
24# 0x00007FFD9C1B1A9D in WindowsBase_ni
25# 0x00007FFD9C1B044F in WindowsBase_ni
26# 0x00007FFD9C1B34E4 in WindowsBase_ni
27# 0x00007FFD9C1B38E4 in WindowsBase_ni
28# 0x00007FFD9C1B3F28 in WindowsBase_ni
29# 0x00007FFD9C1B3E26 in WindowsBase_ni
30# 0x00007FFD9C1B1432 in WindowsBase_ni
31# 0x00007FFD9C1B3252 in WindowsBase_ni
32# 0x00007FFD9C373E42 in WindowsBase_ni
33# 0x00007FFD78AA21FE in clr
34# CallWindowProcW in USER32
35# DispatchMessageW in USER32
36# 0x00007FFD9C1D4649 in WindowsBase_ni
37# 0x00007FFD9C1AEDF5 in WindowsBase_ni
38# 0x00007FFD99F465E1 in PresentationFramework_ni
39# 0x00007FFD99F4601C in PresentationFramework_ni
40# 0x00007FFD195C0AE7
41# DllCanUnloadNowInternal in clr
42# DllCanUnloadNowInternal in clr
43# DllCanUnloadNowInternal in clr
44# SetRuntimeInfo in clr
45# SetRuntimeInfo in clr
46# SetRuntimeInfo in clr
47# SetRuntimeInfo in clr
48# SetRuntimeInfo in clr
49# CorExeMain in clr
50# CorExeMain in mscoreei
51# CorExeMain in MSCOREE
52# BaseThreadInitThunk in KERNEL32
53# RtlUserThreadStart in ntdll

It keeps poppin up.
EDIT:
restarting computer solved the issue