Ok, so here is what I got in my latest log file :
[2018.01.16-15.39.32:995][ 0]LogThreadingWindows: Error: Runnable thread FAssetDataGatherer crashed.
[2018.01.16-15.39.32:995][ 0]LogWindows: Error: === Critical error: ===
[2018.01.16-15.39.32:995][ 0]LogWindows: Error:
[2018.01.16-15.39.32:995][ 0]LogWindows: Error: Fatal error: [File:D:\Build++UE4+Release-4.18+Compile\Sync\Engine\Source\Runtime\Core\Private\GenericPlatform\GenericPlatformMemory.cpp] [Line: 183]
[2018.01.16-15.39.32:995][ 0]LogWindows: Error: Ran out of memory allocating 23714955484 bytes with alignment 0
[…]
[2018.01.16-15.39.32:996][ 0]LogWindows: Error: Crash in runnable thread FAssetDataGatherer
[2018.01.16-15.39.33:018][ 0]LogExit: Executing StaticShutdownAfterError
[2018.01.16-15.39.33:018][ 0]LogWindows: FPlatformMisc::RequestExit(1)
[2018.01.16-15.39.33:018][ 0]Log file closed, 01/16/18 16:39:33
And this error only appears on this project only