Steps to repro:

1. Open attached project and 'ProgressiveLightmappingExample' scene;
2. Open Lighting window (Window>Lighting>Settings);
3. Clear Baked Data in the Lighting window;
4. In the Hierarchy enable 'Directional Light' gameobject;
5. In the Lighting window click 'Generate Lighting' button;
6. While the lighting is baked in the Scene view switch scene visualization mode to either 'Indirect' or 'Emissive'.

Actual result:
Error:

' ''Runtime Texture' job failed with error code: 2 ('Failed to get runtime texture size.').
0x000000014149C6B8 (Unity) StackWalker::GetCurrentCallstack
0x00000001414A2BF6 (Unity) StackWalker::ShowCallstack
0x00000001413751FB (Unity) GetStacktrace
0x0000000140872A40 (Unity) DebugStringToFile
0x0000000140DAF1D6 (Unity) IQueueJob::HandleFailure
0x0000000140DAF6D9 (Unity) JobManager::IntegrateCompletedJobs
0x00000001420488C0 (Unity) EnlightenRuntimeManager::Update
0x000000014110718E (Unity) GISceneManager::Update
0x0000000141101EF5 (Unity) `GISceneManager::GISceneManager'::`2'::tickGIInEditorRegistrator::Forward
0x0000000140609589 (Unity) CallbackArray::Invoke
0x00000001413B0DE9 (Unity) Application::TickTimer
0x0000000141579A9E (Unity) MainMessageLoop
0x000000014157BA33 (Unity) WinMain
0x00000001428EA77A (Unity) __scrt_common_main_seh
0x00007FFA5FC42774 (KERNEL32) BaseThreadInitThunk
0x00007FFA5FDB0D51 (ntdll) RtlUserThreadStart
'

is shown in the Console. See attached video.
Regression introduced in Unity 2017.3.0.

Expected result:
No errors are shown when switching Editor visualization mode.

Notes:
- Reproducible in 2018.2.0a1, 2018.1.0b6, 2017.3.0p2;
- Not reproducible in 2017.2.1p3, 2017.1.3f1;
- Reproducible on both Windows and OSX;
- Reproducible only for Realtime GI; not reproducible for Baked GI.