Fix an issue that occurs when layers are removed or changed in QGIS

Author: XavierCLL

gui/main_dialog.py

@@ -633,6 +633,18 @@ def closeEvent(self, event):
                 # don't close
                 event.ignore()
                 return
+
+        # disconnect signals for combo boxes
+        try:
+            self.QCBox_LayerToEdit.layerChanged.disconnect()
+            self.QCBox_band_LayerToEdit.currentIndexChanged.disconnect()
+            # self.QCBox_RenderFile.layerChanged
+            for view_widget in ThRasEDialog.view_widgets:
+                for layer_toolbar in view_widget.layer_toolbars:
+                    layer_toolbar.QCBox_RenderFile.layerChanged.disconnect()
+        except Exception:
+            pass
+
         # close
         self.closingPlugin.emit()
         event.accept()

gui/render_widget.py

@@ -70,7 +70,9 @@ def update_render_layers(self):
                 # use the crs set in Qgis
                 self.canvas.setDestinationCrs(iface.mapCanvas().mapSettings().destinationCrs())
             # get all valid activated layers
-            valid_layers = [layer_toolbar.layer for layer_toolbar in self.layer_toolbars if layer_toolbar.is_active]
+            valid_layers = [layer_toolbar.layer for layer_toolbar in self.layer_toolbars
+                           if layer_toolbar.is_active and layer_toolbar.layer is not None
+                           and layer_toolbar.layer.isValid()]
             if len(valid_layers) == 0:
                 self.canvas.setLayers([])
                 self.refresh()