Do not destroy a PETSc matrix twice.

diff --git a/source/lac/petsc_parallel_sparse_matrix.cc b/source/lac/petsc_parallel_sparse_matrix.cc
index 069667ac51dd54228ae576f6de1156e546451ee7..87626f8eaa7cfcd21408eb55eefd70a86aa15df6 100644 (file)
--- a/source/lac/petsc_parallel_sparse_matrix.cc
+++ b/source/lac/petsc_parallel_sparse_matrix.cc
@@ -196,7 +196,6 @@ namespace PETScWrappers
       this->communicator = communicator;
 
       // get rid of old matrix and generate a new one
-      destroy_matrix (matrix);
       const PetscErrorCode ierr = destroy_matrix (matrix);
       AssertThrow (ierr == 0, ExcPETScError (ierr));