Your computer was restarted because of a problem - Log Erros

Hello, this morning my iMac was booting up and showed the white screen warning a error occurred and was restarting it.

Here's the log after booting up again normal:

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• Panic Report ***

panic(cpu 1 caller 0xffffff7f90a23d32): "Did you forget to call contextStop when contextStart failed?"@/BuildRoot/Library/Caches/com.apple.xbs/Sources/IOAcceleratorFamily_kexts/IOAcceleratorFamily-404.14/Kext2/IOGraphicsAccelerator.cpp:1862

Backtrace (CPU 1), Frame : Return Address

0xffffff911eca3940 : 0xffffff800f9ae6ed

0xffffff911eca3990 : 0xffffff800faea185

0xffffff911eca39d0 : 0xffffff800fadb8ba

0xffffff911eca3a40 : 0xffffff800f95bb40

0xffffff911eca3a60 : 0xffffff800f9ae107

0xffffff911eca3b80 : 0xffffff800f9adf53

0xffffff911eca3bf0 : 0xffffff7f90a23d32

0xffffff911eca3c80 : 0xffffff8010029950

0xffffff911eca3cd0 : 0xffffff801008e89a

0xffffff911eca3d30 : 0xffffff800fa96052

0xffffff911eca3d80 : 0xffffff800f9b3f2c

0xffffff911eca3dd0 : 0xffffff800f98eca1

0xffffff911eca3e50 : 0xffffff800f9a33be

0xffffff911eca3ef0 : 0xffffff800fac17e7

0xffffff911eca3fa0 : 0xffffff800f95c326

      Kernel Extensions in backtrace:

         com.apple.iokit.IOAcceleratorFamily2(404.14)[618B24B5-1387-31FD-A7F7-53283E2C3FEA]@0xffffff7f909f2000->0xffffff7f90a98fff

            dependency: com.apple.driver.AppleMobileFileIntegrity(1.0.5)[1D716047-7F62-3FFA-8C01-26C166B3739A]@0xffffff7f909aa000

            dependency: com.apple.iokit.IOSurface(255.6.1)[263BDC28-38C8-3995-BB6B-AD419E41C2DC]@0xffffff7f909c7000

            dependency: com.apple.iokit.IOPCIFamily(2.9)[BFDEB8D4-50FE-3DDB-87B7-F6A504393830]@0xffffff7f90295000

            dependency: com.apple.iokit.IOGraphicsFamily(530.66)[373EAB85-2C5F-3B84-B86D-421F79C47DF2]@0xffffff7f90583000

            dependency: com.apple.iokit.IOReportFamily(47)[0BC9F93B-456A-3D97-BE4C-69DCBB5E8A3C]@0xffffff7f909eb000

BSD process name corresponding to current thread: WindowServer

Mac OS version:

18G103

Kernel version:

Darwin Kernel Version 18.7.0: Tue Aug 20 16:57:14 PDT 2019; root:xnu-4903.271.2~2/RELEASE_X86_64

Kernel UUID: C41337A1-0EC3-3896-A954-A1F85E849D53

Kernel slide:     0x000000000f600000

Kernel text base: 0xffffff800f800000

__HIB  text base: 0xffffff800f700000

System model name: iMac13,1 (Mac-00BE6ED71E35EB86)

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Anybody knows what could be? CPU or just Software/OSX conflit with files?

I'm doing memtest right now to see if anything comes up