SEGV_MAPERR at 0x3 in Map.h after converting from 4.11 to 4.12

Development Programming & Scripting C++
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I had a project that was working fine in 4.11 and a few days ago I tried to convert it into 4.12 (mainly to use sequencer) and I get this:

the log

I’m on OSX with an AMD card

it seems to be just an assert for a nullptr in Map…

[2016.05.06-00.37.31:835][  0]LogMaterial: Missing cached shader map for material bodywork, compiling. 
Assertion failed: Pair != nullptr [File:Runtime/Core/Public/Containers/Map.h] [Line: 508]

PS: I flagged this as a “bug” bug maybe I’m doing something wrong… but it was working fine in 4.11 and I do not use maps in my C++ code