Fix the assert condition

diff --git a/include/deal.II/lac/trilinos_tpetra_vector.templates.h b/include/deal.II/lac/trilinos_tpetra_vector.templates.h
index eccc2f41eeef926388c4569af55741615b94547b..1546012d51499fff2d5942983f1c074ef4dd8fdd 100644 (file)
--- a/include/deal.II/lac/trilinos_tpetra_vector.templates.h
+++ b/include/deal.II/lac/trilinos_tpetra_vector.templates.h
@@ -243,7 +243,7 @@ namespace LinearAlgebra
             const TpetraWrappers::CommunicationPattern>(communication_pattern);
 
           AssertThrow(
-            tpetra_comm_pattern.is_null(),
+            !tpetra_comm_pattern.is_null(),
             ExcMessage(
               std::string("The communication pattern is not of type ") +
               "LinearAlgebra::TpetraWrappers::CommunicationPattern."));