Lightbuild crash

I’m getting a Lightbuild crash after a few seconds of building. 4.19 with a geometry heavy scene (about 180 meshes totaling about 5 Million faces) imported over DataSmith from 3dsmax.
On first light build UE crashes with a “out of graphic memory” error. Consecutive builds lead to this errors (see attachment).
Already deleted the saves and intermediate folders but no solution yet.
I also tried to take the biggest meshes out of static light, but the scene won’t lightbuild.
Any ideas?