Assertion error during adapt_grid in 3D

I am getting an assertion error when using grid adaptivity with simplical 3D UG grids (does not occur with rectangles).

Full backtrace: dorie_bt.txt

Apparently, coeffs.localKey(i).subEntity() in Dune::PDELab::LeafLocalFunctionSpaceNode::dofIndices returns an uninitialized value (coeffs.localKey(i) gives (const Dune::LocalKey &) @0x66641a0: {values_ = {_M_elems = {3130763216, 4, 0}}}).

Let me know if you need any further information.