Address row_start

diff --git a/include/deal.II/matrix_free/cuda_matrix_free.templates.h b/include/deal.II/matrix_free/cuda_matrix_free.templates.h
index 64a399bb68cdd60588a448b3e9bc90969a327cfd..7a5e1460cc7b8427190f963f3a8bfe7d6cfc829f 100644 (file)
--- a/include/deal.II/matrix_free/cuda_matrix_free.templates.h
+++ b/include/deal.II/matrix_free/cuda_matrix_free.templates.h
@@ -894,7 +894,8 @@ namespace CUDAWrappers
       }
 
     // Setup row starts
-    row_start[0] = 0;
+    if (n_colors > 0)
+      row_start[0] = 0;
     for (unsigned int i = 1; i < n_colors; ++i)
       row_start[i] = row_start[i - 1] + n_cells[i - 1] * get_padding_length();