diff --git a/common.pri b/common.pri
index 4c8b2c7..5eccf64 100644
--- a/common.pri
+++ b/common.pri
@@ -105,7 +105,7 @@ RCC_DIR        = $${ARCH_DIR}/$${BUILD_TYPE}/rcc
 
 LIMEREPORT_VERSION_MAJOR = 1
 LIMEREPORT_VERSION_MINOR = 4
-LIMEREPORT_VERSION_RELEASE = 87
+LIMEREPORT_VERSION_RELEASE = 88
 
 LIMEREPORT_VERSION = '$${LIMEREPORT_VERSION_MAJOR}.$${LIMEREPORT_VERSION_MINOR}.$${LIMEREPORT_VERSION_RELEASE}'
 DEFINES *= LIMEREPORT_VERSION_STR=\\\"$${LIMEREPORT_VERSION}\\\"
diff --git a/limereport/databrowser/lrsqleditdialog.cpp b/limereport/databrowser/lrsqleditdialog.cpp
index ae0d297..2a05e69 100644
--- a/limereport/databrowser/lrsqleditdialog.cpp
+++ b/limereport/databrowser/lrsqleditdialog.cpp
@@ -113,8 +113,8 @@ void SQLEditDialog::accept()
     if (ui->fieldsMap->rowCount()>0){
         for(int i=0;i<ui->fieldsMap->rowCount();++i){
             LimeReport::FieldsCorrelation fieldsCorrelation;
-            fieldsCorrelation.master=ui->fieldsMap->item(i,0)->data(Qt::DisplayRole).toString();
-            fieldsCorrelation.detail=ui->fieldsMap->item(i,1)->data(Qt::DisplayRole).toString();
+            fieldsCorrelation.master = ui->fieldsMap->item(i,0) ? ui->fieldsMap->item(i,0)->data(Qt::DisplayRole).toString() : "";
+            fieldsCorrelation.detail = ui->fieldsMap->item(i,1) ? ui->fieldsMap->item(i,1)->data(Qt::DisplayRole).toString() : "";
             result.fieldMap.append(fieldsCorrelation);
         }
     }
@@ -350,4 +350,13 @@ void SQLEditDialog::hidePreview()
     ui->pbHidePreview->setVisible(false);
 }
 
+void SQLEditDialog::on_pbDelField_clicked()
+{
+    ui->fieldsMap->removeRow(ui->fieldsMap->currentRow());
+}
+
 } // namespace LimeReport
+
+
+
+
diff --git a/limereport/databrowser/lrsqleditdialog.h b/limereport/databrowser/lrsqleditdialog.h
index 0f6759a..55166a9 100644
--- a/limereport/databrowser/lrsqleditdialog.h
+++ b/limereport/databrowser/lrsqleditdialog.h
@@ -73,6 +73,7 @@ private slots:
     void on_rbProxy_clicked(bool checked);
     void on_rbSubQuery_clicked(bool checked);
     void on_pbAddField_clicked();
+    void on_pbDelField_clicked();
     void initQueryMode();
     void initSubQueryMode();
     void initProxyMode();
diff --git a/limereport/lrdatadesignintf.cpp b/limereport/lrdatadesignintf.cpp
index 2cde1d9..5f695e8 100644
--- a/limereport/lrdatadesignintf.cpp
+++ b/limereport/lrdatadesignintf.cpp
@@ -638,14 +638,17 @@ QVariant MasterDetailProxyModel::sourceData(QString fieldName, int row) const
 QVariant MasterDetailProxyModel::masterData(QString fieldName) const
 {
     IDataSource* master = dataManager()->dataSource(m_masterName);
-    int columnIndex = master->columnIndexByName(fieldName);
-    if (columnIndex!=-1){
-        return master->data(fieldName);
-    } else {
-        throw ReportError(
-            tr("Field: \"%1\" not found in \"%2\" master datasource").arg(fieldName).arg(m_masterName)
-        );
+    if (master){
+        int columnIndex = master->columnIndexByName(fieldName);
+        if (columnIndex!=-1){
+            return master->data(fieldName);
+        } else {
+            throw ReportError(
+                tr("Field: \"%1\" not found in \"%2\" master datasource").arg(fieldName).arg(m_masterName)
+            );
+        }
     }
+    return QVariant();
 }
 
 bool CallbackDatasource::next(){