diff --git a/python/plugins/processing/algs/gdal/GdalAlgorithmDialog.py b/python/plugins/processing/algs/gdal/GdalAlgorithmDialog.py
index d5f2137f485..e0180754dfe 100644
--- a/python/plugins/processing/algs/gdal/GdalAlgorithmDialog.py
+++ b/python/plugins/processing/algs/gdal/GdalAlgorithmDialog.py
@@ -40,9 +40,8 @@ class GdalAlgorithmDialog(AlgorithmDialog):
         AlgorithmDialogBase.__init__(self, alg)
 
         self.alg = alg
-
-        self.mainWidget = GdalParametersPanel(self, alg)
-        self.setMainWidget()
+ 
+        self.setMainWidget(GdalParametersPanel(self, alg))
 
         cornerWidget = QWidget()
         layout = QVBoxLayout()
@@ -56,10 +55,6 @@ class GdalAlgorithmDialog(AlgorithmDialog):
 
         self.mainWidget.parametersHaveChanged()
 
-        QgsMapLayerRegistry.instance().layerWasAdded.connect(self.mainWidget.layerAdded)
-        QgsMapLayerRegistry.instance().layersWillBeRemoved.connect(self.mainWidget.layersWillBeRemoved)
-
-
 class GdalParametersPanel(ParametersPanel):
 
     def __init__(self, parent, alg):
diff --git a/python/plugins/processing/algs/qgis/ui/FieldsMapperDialogs.py b/python/plugins/processing/algs/qgis/ui/FieldsMapperDialogs.py
index 8d7f443afe7..c90f46bec1e 100644
--- a/python/plugins/processing/algs/qgis/ui/FieldsMapperDialogs.py
+++ b/python/plugins/processing/algs/qgis/ui/FieldsMapperDialogs.py
@@ -98,8 +98,7 @@ class FieldsMapperParametersDialog(AlgorithmDialog):
 
         self.alg = alg
 
-        self.mainWidget = FieldsMapperParametersPanel(self, alg)
-        self.setMainWidget()
+        self.setMainWidget(FieldsMapperParametersPanel(self, alg))
 
     def setParamValue(self, param, widget, alg=None):
         if isinstance(param, ParameterFieldsMapping):
diff --git a/python/plugins/processing/gui/AlgorithmDialog.py b/python/plugins/processing/gui/AlgorithmDialog.py
index f6f294f45a8..4a6f640cb25 100644
--- a/python/plugins/processing/gui/AlgorithmDialog.py
+++ b/python/plugins/processing/gui/AlgorithmDialog.py
@@ -69,8 +69,7 @@ class AlgorithmDialog(AlgorithmDialogBase):
 
         self.alg = alg
 
-        self.mainWidget = ParametersPanel(self, alg)
-        self.setMainWidget()
+        self.setMainWidget(ParametersPanel(self, alg))
 
         self.cornerWidget = QWidget()
         layout = QVBoxLayout()
@@ -82,8 +81,6 @@ class AlgorithmDialog(AlgorithmDialogBase):
         self.cornerWidget.setLayout(layout)
         self.tabWidget.setCornerWidget(self.cornerWidget)
 
-        QgsMapLayerRegistry.instance().layerWasAdded.connect(self.mainWidget.layerRegistryChanged)
-        QgsMapLayerRegistry.instance().layersWillBeRemoved.connect(self.mainWidget.layerRegistryChanged)
 
     def runAsBatch(self):
         self.close()
diff --git a/python/plugins/processing/gui/AlgorithmDialogBase.py b/python/plugins/processing/gui/AlgorithmDialogBase.py
index 651e5fea291..53045dd820a 100644
--- a/python/plugins/processing/gui/AlgorithmDialogBase.py
+++ b/python/plugins/processing/gui/AlgorithmDialogBase.py
@@ -35,7 +35,7 @@ from qgis.PyQt.QtWidgets import QApplication, QDialogButtonBox, QDesktopWidget
 from qgis.PyQt.QtNetwork import QNetworkRequest, QNetworkReply
 
 from qgis.utils import iface
-from qgis.core import QgsNetworkAccessManager
+from qgis.core import QgsNetworkAccessManager, QgsMapLayerRegistry
 
 from processing.core.ProcessingConfig import ProcessingConfig
 
@@ -122,8 +122,15 @@ class AlgorithmDialogBase(BASE, WIDGET):
         self.settings.setValue("/Processing/dialogBase", self.saveGeometry())
         super(AlgorithmDialogBase, self).closeEvent(evt)
 
-    def setMainWidget(self):
+    def setMainWidget(self, widget):
+        if self.mainWidget is not None:
+            QgsMapLayerRegistry.instance().layerWasAdded.disconnect(self.mainWidget.layerRegistryChanged)
+            QgsMapLayerRegistry.instance().layersWillBeRemoved.disconnect(self.mainWidget.layerRegistryChanged)
+        self.mainWidget = widget
         self.tabWidget.widget(0).layout().addWidget(self.mainWidget)
+        QgsMapLayerRegistry.instance().layerWasAdded.connect(self.mainWidget.layerRegistryChanged)
+        QgsMapLayerRegistry.instance().layersWillBeRemoved.connect(self.mainWidget.layerRegistryChanged)
+
 
     def error(self, msg):
         QApplication.restoreOverrideCursor()
diff --git a/python/plugins/processing/gui/BatchAlgorithmDialog.py b/python/plugins/processing/gui/BatchAlgorithmDialog.py
index 59c8dfdc2ed..dfda489b6c7 100644
--- a/python/plugins/processing/gui/BatchAlgorithmDialog.py
+++ b/python/plugins/processing/gui/BatchAlgorithmDialog.py
@@ -56,8 +56,7 @@ class BatchAlgorithmDialog(AlgorithmDialogBase):
 
         self.setWindowTitle(self.tr('Batch Processing - %s') % self.alg.name)
 
-        self.mainWidget = BatchPanel(self, self.alg)
-        self.setMainWidget()
+        self.setMainWidget(BatchPanel(self, self.alg))
 
         self.textShortHelp.setVisible(False)
 
diff --git a/python/plugins/processing/gui/BatchPanel.py b/python/plugins/processing/gui/BatchPanel.py
index 787008fb074..0968cfb8531 100644
--- a/python/plugins/processing/gui/BatchPanel.py
+++ b/python/plugins/processing/gui/BatchPanel.py
@@ -88,6 +88,10 @@ class BatchPanel(BASE, WIDGET):
             self.fillParameterValues)
 
         self.initWidgets()
+        
+        
+    def layerRegistryChanged(self):
+        pass
 
     def initWidgets(self):
         # If there are advanced parameters — show corresponding button