Added one assertion to setup_line_to_cell.

diff --git a/include/deal.II/matrix_free/hanging_nodes_internal.h b/include/deal.II/matrix_free/hanging_nodes_internal.h
index cc770bc39c6aee61949924a88d9bdf86f0e848d7..03b6596820d9ebb099c2f952472701455b301f77 100644 (file)
--- a/include/deal.II/matrix_free/hanging_nodes_internal.h
+++ b/include/deal.II/matrix_free/hanging_nodes_internal.h
@@ -474,6 +474,8 @@ namespace internal
                   const unsigned int child_line_idx =
                     child->line_index(neighbor_line);
 
+                  Assert(child->is_active(), ExcInternalError());
+
                   // Now add all active cells
                   for (const auto &cl : line_to_cells[line_idx])
                     line_to_cells[child_line_idx].push_back(cl);