OpenSCAD bug (no replies)

Any OpenSCAD developer around?
When I press F5 on my model I get:
OpenGL Program Validation results:
Validation successful.
openscad: src/csgterm.cc:191: void CSGChain::import(boost::shared_ptr, CSGTerm::type_e, CSGTerm::Flag): Assertion `term->left && term->right' failed.

Edit: happens also in the latest git version.