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Here is the log file and stack trace.

0.005 2016-03-12 18:27:57; Factorio 0.12.26 (Build 17762, win64)
0.005 Operating system: Windows 7 Service Pack 1
0.005 Program arguments: "D:\Program Files (x86)\Steam\steamapps\common\Factorio\bin\x64\Factorio.exe"
0.005 Read data path: D:/Program Files (x86)/Steam/steamapps/common/Factorio/data
0.005 Write data path: C:/Users/Xemu/AppData/Roaming/Factorio
0.005 Binaries path: D:/Program Files (x86)/Steam/steamapps/common/Factorio/bin
0.132 Available display adapters: 1
0.132 [0]: \\.\DISPLAY1 - NVIDIA GeForce GTX 560 Ti {0x80000, no details}
0.133 [2]: \\.\DISPLAY3 - NVIDIA GeForce GTX 560 Ti {0x80005, [0,0], 2560x1440, 32bit, 60Hz}
0.133 Create display on adapter 0. Size 1280x720 at position [630, 342].
0.499 Initialised Direct3D:[0] NVIDIA GeForce GTX 560 Ti ; driver: nvd3dumx.dll 9.18.13.3788
0.599 Desktop composition is active.
0.599 Graphics options: [FullScreen: true] [VSync: true] [UIScale: 100%] [MultiSampling: OFF] [Graphics quality: normal] [Video memory usage: high] [Light scale: 20%] [Screen: 255]
0.780 Loading mod core 0.0.0 (data.lua)
0.829 Loading mod base 0.12.26 (data.lua)
3.931 Initial atlas bitmap size is 16384
3.934 Created atlas bitmap 16384x5511
61.569 Factorio initialised
97.389 Loading map C:/Users\Xemu\AppData\Roaming\Factorio\saves\c2-2a-3.zip
97.467 Info Scenario.cpp:124: Map version 0.12.26-0
2731.913 Applying migration: Base Mod: 2015-07-02_Factorio_0.12.0.lua
2731.928 Applying migration: Base Mod: 2015-10-02_Factorio_0.12.9.lua
2731.930 Applying migration: Base Mod: 2015-11-14_Factorio_0.12.11.lua
2731.931 Applying migration: Base Mod: 2016-03-05_Factorio_0.12.26.lua
2732.574 Info Scenario.cpp:124: Map version 0.12.26-0
2905.864 Applying migration: Base Mod: 2015-07-02_Factorio_0.12.0.lua
2905.867 Applying migration: Base Mod: 2015-10-02_Factorio_0.12.9.lua
2905.867 Applying migration: Base Mod: 2015-11-14_Factorio_0.12.11.lua
2905.868 Applying migration: Base Mod: 2016-03-05_Factorio_0.12.26.lua
2906.004 Info Scenario.cpp:124: Map version 0.12.26-0
2950.804 Applying migration: Base Mod: 2015-07-02_Factorio_0.12.0.lua
2950.807 Applying migration: Base Mod: 2015-10-02_Factorio_0.12.9.lua
2950.808 Applying migration: Base Mod: 2015-11-14_Factorio_0.12.11.lua
2950.809 Applying migration: Base Mod: 2016-03-05_Factorio_0.12.26.lua
2950.951 Info Scenario.cpp:124: Map version 0.12.26-0
2984.641 Applying migration: Base Mod: 2015-07-02_Factorio_0.12.0.lua
2984.644 Applying migration: Base Mod: 2015-10-02_Factorio_0.12.9.lua
2984.645 Applying migration: Base Mod: 2015-11-14_Factorio_0.12.11.lua
2984.645 Applying migration: Base Mod: 2016-03-05_Factorio_0.12.26.lua
2984.787 Info Scenario.cpp:124: Map version 0.12.26-0
3855.135 Loading map C:/Users\Xemu\AppData\Roaming\Factorio\saves\c3-3.zip
3855.252 Info Scenario.cpp:124: Map version 0.12.26-0
4122.636 Loading map C:/Users\Xemu\AppData\Roaming\Factorio\saves\c3-3.zip
4122.755 Info Scenario.cpp:124: Map version 0.12.26-0
4873.989 Loading map C:/Users\Xemu\AppData\Roaming\Factorio\saves\_autosave2.zip
4874.107 Info Scenario.cpp:124: Map version 0.12.26-0
4981.980 Applying migration: Base Mod: 2015-07-02_Factorio_0.12.0.lua
4981.984 Applying migration: Base Mod: 2015-10-02_Factorio_0.12.9.lua
4981.985 Applying migration: Base Mod: 2015-11-14_Factorio_0.12.11.lua
4981.985 Applying migration: Base Mod: 2016-03-05_Factorio_0.12.26.lua
4982.557 Info Scenario.cpp:124: Map version 0.12.26-0
6855.153 Loading map C:/Users\Xemu\AppData\Roaming\Factorio\saves\c4-1.zip
6855.284 Info Scenario.cpp:124: Map version 0.12.26-0
9467.323 Error GameView.cpp:874: Close active window called while game is being saved.
Factorio crashed. Generating symbolized stacktrace, please wait ...
c:\cygwin64\tmp\factorio-vtnylx\libraries\stackwalker\stackwalker.cpp (923): StackWalker::ShowCallstack
c:\cygwin64\tmp\factorio-vtnylx\src\util\logger.cpp (298): Logger::writeStacktrace
c:\cygwin64\tmp\factorio-vtnylx\src\util\logger.cpp (352): Logger::logStacktrace
c:\cygwin64\tmp\factorio-vtnylx\src\util\crashhandler.cpp (84): CrashHandler::writeStackTrace
c:\cygwin64\tmp\factorio-vtnylx\src\util\crashhandler.cpp (153): CrashHandler::SignalHandler
f:\dd\vctools\crt\crtw32\misc\winsig.c (587): raise
f:\dd\vctools\crt\crtw32\misc\abort.c (82): abort
c:\cygwin64\tmp\factorio-vtnylx\src\gameview.cpp (874): GameView::closeActiveWindow
c:\cygwin64\tmp\factorio-vtnylx\src\gameview.cpp (341): GameView::closeGui
c:\cygwin64\tmp\factorio-vtnylx\src\gameview.cpp (363): GameView::loadGuiForController
c:\cygwin64\tmp\factorio-vtnylx\src\gameview.cpp (207): GameView::executeAction
c:\cygwin64\tmp\factorio-vtnylx\src\gameview.cpp (173): GameView::executeActions
c:\cygwin64\tmp\factorio-vtnylx\src\game.cpp (175): Game::postUpdate
c:\cygwin64\tmp\factorio-vtnylx\src\mainloop.cpp (198): MainLoop::prepare
c:\cygwin64\tmp\factorio-vtnylx\src\mainloop.cpp (473): MainLoop::tickStep
c:\cygwin64\tmp\factorio-vtnylx\src\mainloop.cpp (569): MainLoop::run
c:\cygwin64\tmp\factorio-vtnylx\src\main.cpp (477): wmain
f:\dd\vctools\crt\crtw32\startup\crt0.c (255): __tmainCRTStartup
ERROR: SymGetLineFromAddr64, GetLastError: 487 (Address: 00000000779E59ED)
00000000779E59ED (kernel32): (filename not available): BaseThreadInitThunk
ERROR: SymGetLineFromAddr64, GetLastError: 487 (Address: 0000000077B1B371)
0000000077B1B371 (ntdll): (filename not available): RtlUserThreadStart
9469.432 Error Util.cpp:77: Unexpected error occurred. You can help us to solve the problem by posting the contents of the log file on the Factorio forums.

Thanks for the report, it is fixed for 0.12.27 now.