diff --git a/src/ops/removevolumegroupoperation.cpp b/src/ops/removevolumegroupoperation.cpp
index afe7f3c..c269bbb 100644
--- a/src/ops/removevolumegroupoperation.cpp
+++ b/src/ops/removevolumegroupoperation.cpp
@@ -1,74 +1,75 @@
 /*************************************************************************
  *  Copyright (C) 2016 by Chantara Tith <tith.chantara@gmail.com>        *
  *                                                                       *
  *  This program is free software; you can redistribute it and/or        *
  *  modify it under the terms of the GNU General Public License as       *
  *  published by the Free Software Foundation; either version 3 of       *
  *  the License, or (at your option) any later version.                  *
  *                                                                       *
  *  This program is distributed in the hope that it will be useful,      *
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of       *
  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the        *
  *  GNU General Public License for more details.                         *
  *                                                                       *
  *  You should have received a copy of the GNU General Public License    *
  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.*
  *************************************************************************/
 
 #include "ops/removevolumegroupoperation.h"
 #include "jobs/removevolumegroupjob.h"
 
 #include "core/partition.h"
 #include "core/partitiontable.h"
 #include "core/volumemanagerdevice.h"
 
 #include <QString>
 
 #include <KLocalizedString>
 
 /** Creates a new RemoveVolumeGroupOperation.
 */
 RemoveVolumeGroupOperation::RemoveVolumeGroupOperation(VolumeManagerDevice& d) :
     Operation(),
     m_RemoveVolumeGroupJob(new RemoveVolumeGroupJob(d)),
-    m_Device(d)
+    m_Device(d),
+    m_PartitionTable(nullptr)
 {
     addJob(removeVolumeGroupJob());
 }
 
 QString RemoveVolumeGroupOperation::description() const
 {
     return xi18nc("@info/plain", "Remove a LVM volume group.");
 }
 
 void RemoveVolumeGroupOperation::preview()
 {
     m_PartitionTable = device().partitionTable();
     device().setPartitionTable(new PartitionTable(PartitionTable::vmd, 0, device().totalLogical() - 1));
 }
 
 void RemoveVolumeGroupOperation::undo()
 {
     device().setPartitionTable(m_PartitionTable);
 }
 
 /** Check if Volume Group can be safely removed
  *
  *  @param dev VolumeManagerDevice with initialized partitions
  *  @return true if there are no LVM partitions.
  */
 bool RemoveVolumeGroupOperation::isRemovable(const VolumeManagerDevice* dev)
 {
     // TODO: allow removal when LVs are inactive.
     if (dev->type() == Device::LVM_Device) {
         if (dev->partitionTable()->children().count() == 0) // This is necessary to prevent a crash during applying of operations
             return true;
         else if (dev->partitionTable()->children().count() > 1)
             return false;
         else
             if (dev->partitionTable()->children().first()->fileSystem().type() == FileSystem::Unknown)
                 return true;
     }
 
     return false;
 }