diff --git a/common.pri b/common.pri
index db77728..7d1aadf 100644
--- a/common.pri
+++ b/common.pri
@@ -62,7 +62,7 @@ RCC_DIR        = $${ARCH_DIR}/$${BUILD_TYPE}/rcc
 
 LIMEREPORT_VERSION_MAJOR = 1
 LIMEREPORT_VERSION_MINOR = 4
-LIMEREPORT_VERSION_RELEASE = 49
+LIMEREPORT_VERSION_RELEASE = 51
 
 LIMEREPORT_VERSION = '\\"$${LIMEREPORT_VERSION_MAJOR}.$${LIMEREPORT_VERSION_MINOR}.$${LIMEREPORT_VERSION_RELEASE}\\"'
 DEFINES += LIMEREPORT_VERSION_STR=\"$${LIMEREPORT_VERSION}\"
diff --git a/limereport/lrdatadesignintf.cpp b/limereport/lrdatadesignintf.cpp
index d33eda8..78f8ab2 100644
--- a/limereport/lrdatadesignintf.cpp
+++ b/limereport/lrdatadesignintf.cpp
@@ -57,21 +57,21 @@ IDataSource * ModelHolder::dataSource(IDataSource::DatasourceMode mode)
 }
 
 QueryHolder::QueryHolder(QString queryText, QString connectionName, DataSourceManager *dataManager)
-    : m_query(0), m_queryText(queryText), m_connectionName(connectionName),
+    : m_queryText(queryText), m_connectionName(connectionName),
       m_mode(IDataSource::RENDER_MODE), m_dataManager(dataManager), m_prepared(true)
 {
     extractParams();
 }
 
-QueryHolder::~QueryHolder()
-{
-    if (m_query) delete m_query;
-}
+QueryHolder::~QueryHolder(){}
 
 bool QueryHolder::runQuery(IDataSource::DatasourceMode mode)
 {
     m_mode = mode;
+
     QSqlDatabase db = QSqlDatabase::database(m_connectionName);
+    QSqlQuery* query = new QSqlQuery(db);
+
     if (!db.isValid()) {
         setLastError(QObject::tr("Invalid connection! %1").arg(m_connectionName));
         return false;
@@ -82,16 +82,13 @@ bool QueryHolder::runQuery(IDataSource::DatasourceMode mode)
         if (!m_prepared) return false;
     }
 
-    if (!m_query){
-        m_query = new QSqlQuery(db);
-        m_query->prepare(m_preparedSQL);
-    }
+    query->prepare(m_preparedSQL);
 
-    fillParams(m_query);
-    m_query->exec();
+    fillParams(query);
+    query->exec();
 
     QSqlQueryModel *model = new QSqlQueryModel;
-    model->setQuery(*m_query);
+    model->setQuery(*query);
 
     while (model->canFetchMore())
         model->fetchMore();
@@ -102,7 +99,7 @@ bool QueryHolder::runQuery(IDataSource::DatasourceMode mode)
         setLastError(model->lastError().text());
         delete model;
         return false;
-    } else setLastError("");
+    } else { setLastError("");}
 
     setDatasource(IDataSource::Ptr(new ModelToDataSource(model,true)));
     return true;
@@ -122,7 +119,6 @@ void QueryHolder::invalidate(IDataSource::DatasourceMode mode, bool dbWillBeClos
     QSqlDatabase db = QSqlDatabase::database(m_connectionName);
     if (!db.isValid() || dbWillBeClosed){
         setLastError(QObject::tr("Invalid connection! %1").arg(m_connectionName));
-        delete m_query;
         m_dataSource.clear();
     } else {
         runQuery(mode);
@@ -197,10 +193,6 @@ void QueryHolder::setQueryText(QString queryText)
 {
     m_queryText=queryText;
     m_prepared = false;
-    if (m_query) {
-        delete m_query;
-        m_query = 0;
-    }
 }
 
 IDataSource* QueryHolder::dataSource(IDataSource::DatasourceMode mode)
diff --git a/limereport/lrdatadesignintf.h b/limereport/lrdatadesignintf.h
index 9910049..cafe60d 100644
--- a/limereport/lrdatadesignintf.h
+++ b/limereport/lrdatadesignintf.h
@@ -199,7 +199,7 @@ public:
     bool isRemovable() const { return true; }
     bool isPrepared() const {return m_prepared;}
     QString lastError() const { return m_lastError; }
-    void setLastError(QString value){m_lastError=value; if (m_query) {delete m_query; m_query=0;}}
+    void setLastError(QString value){m_lastError=value;}
     void invalidate(IDataSource::DatasourceMode mode, bool dbWillBeClosed = false);
     void update();
     void clearErrors(){setLastError("");}
@@ -211,7 +211,6 @@ protected:
     virtual void extractParams();
     QString replaceVariables(QString query);
     QMap<QString,QString> m_aliasesToParam;
-    QSqlQuery* m_query;
     QString m_preparedSQL;
 private:
     QString m_queryText;
diff --git a/limereport/lrdatasourcemanager.cpp b/limereport/lrdatasourcemanager.cpp
index 272c60b..436f35a 100644
--- a/limereport/lrdatasourcemanager.cpp
+++ b/limereport/lrdatasourcemanager.cpp
@@ -933,7 +933,7 @@ void DataSourceManager::disconnectConnection(const QString& connectionName)
         if (isQuery(datasourceName) || isSubQuery(datasourceName)){
             QueryHolder* qh = dynamic_cast<QueryHolder*>(dataSourceHolder(datasourceName));
             if (qh && qh->connectionName().compare(connectionName,Qt::CaseInsensitive)==0){
-                qh->invalidate(designTime()?IDataSource::DESIGN_MODE:IDataSource::RENDER_MODE, true);
+                qh->invalidate(designTime()?IDataSource::DESIGN_MODE:IDataSource::RENDER_MODE);
                 qh->setLastError(tr("invalid connection"));
             }
         }