pre 2.3 crash in nodegraph at opening a saved file

[kubo]

Well, I've searched and haven't quite found this bug.
It happens to me almost everytime when I open a 2.2 scene (the ones I'm doing my test with) save it as 2.3 (some times crashes at save creating a really huge ocs unreadable file) and then if sucessful try to open it again, at loading it gives this error at nodegraph:
Assertion failed!
Program: ...
File: ..\libraries\libnode\nodegraph\nodegraph.cpp
Line: 242
Expression: 0
The one thing this scenes have in common is that they have larger than nodegraph window obj node and are pretty crowed with material nodes. Besides that not sure.
If I hit ignore several times it will eventually load normally, I renders fine, but if I try to do something in the nodegraph it will return the same error and won't let me modify anthing there.

[Nostromo]

Hi Kubo,

Could you please make a little zip for me so I can see what's going on ?

Thanks
/M