From 1d68052c795d0acae54e64cb1f368d18bb33f154 Mon Sep 17 00:00:00 2001
From: Daniel Arndt <daniel.arndt@iwr.uni-heidelberg.de>
Date: Mon, 23 Apr 2018 15:58:18 +0200
Subject: [PATCH] Check dynamic_cast in TimeDependent

---
 source/numerics/time_dependent.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/source/numerics/time_dependent.cc b/source/numerics/time_dependent.cc
index a38be61106..05ecc8a58c 100644
--- a/source/numerics/time_dependent.cc
+++ b/source/numerics/time_dependent.cc
@@ -1074,7 +1074,7 @@ void TimeStepBase_Tria<dim>::refine_grid (const RefinementData refinement_data)
     {
       Triangulation<dim> *previous_tria
         = dynamic_cast<const TimeStepBase_Tria<dim>*>(previous_timestep)->tria;
-
+      Assert(previous_tria != nullptr, ExcInternalError());
 
       // if we used the dual estimator, we
       // computed the error information on
-- 
2.39.5