From 6910396c17a42dda324d54471af6bdb5f4aa0bdb Mon Sep 17 00:00:00 2001
From: Daniel Arndt <daniel.arndt@iwr.uni-heidelberg.de>
Date: Tue, 24 Apr 2018 02:30:40 +0200
Subject: [PATCH] Add assertion for nonempty hp::FECollection

---
 source/hp/dof_handler.cc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/source/hp/dof_handler.cc b/source/hp/dof_handler.cc
index 1e741dd7bd..adb43c610d 100644
--- a/source/hp/dof_handler.cc
+++ b/source/hp/dof_handler.cc
@@ -1281,6 +1281,8 @@ namespace hp
                       "in the constructor before you can distribute DoFs."));
     Assert (tria->n_levels() > 0,
             ExcMessage("The Triangulation you are using is empty!"));
+    Assert (ff.size() > 0,
+            ExcMessage("The hp::FECollection given is empty!"));
 
     if (&fe_collection != &ff)
       fe_collection = hp::FECollection<dim, spacedim>(ff);
-- 
2.39.5