Can't save blueprint with custom component. Graph is linked to private object(s) in an external package

And now the editor crashes on launch and can’t load my level…

MachineId:7B1410024B5F8A1172BFD092EB2F8DC9
EpicAccountId:0c439985bc904ae8aa673c0929588869

Unknown exception - code 00000001 (first/second chance not available)

Assertion failed: !GIsRoutingPostLoad [File:D:\BuildFarm\buildmachine_++depot+UE4-Releases+4.7\Engine\Source\Runtime\CoreUObject\Private\UObject\ScriptCore.cpp] [Line: 799]
Cannot call UnrealScript (CanvasRenderTarget2D //Game//Maps//Example_Map.E

KERNELBASE + 24684 bytes
UE4Editor_Core + 3140052 bytes
UE4Editor_Core + 1614600 bytes
UE4Editor_Core + 1494994 bytes
UE4Editor_CoreUObject + 1478760 bytes
UE4Editor_Engine + 16702051 bytes
UE4Editor_Engine + 2233882 bytes
UE4Editor_Engine + 9088120 bytes
UE4Editor_CoreUObject + 934894 bytes
UE4Editor_CoreUObject + 1386885 bytes
UE4Editor_CoreUObject + 1467036 bytes
UE4Editor_UnrealEd + 2831250 bytes
UE4Editor_UnrealEd + 2761581 bytes
UE4Editor_UnrealEd + 2678685 bytes
UE4Editor_UnrealEd + 6364224 bytes
UE4Editor_UnrealEd + 3235445 bytes
UE4Editor_UnrealEd + 3234600 bytes
UE4Editor_UnrealEd + 6585037 bytes
UE4Editor_UnrealEd + 6358174 bytes
UE4Editor!GuardedMain() + 285 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\launch\private\launch.cpp:123]
UE4Editor!GuardedMainWrapper() + 26 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\launch\private\windows\launchwindows.cpp:126]
UE4Editor!WinMain() + 249 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\launch\private\windows\launchwindows.cpp:202]
UE4Editor!__tmainCRTStartup() + 329 bytes [f:\dd\vctools\crt\crtw32\dllstuff\crtexe.c:618]