diff --git a/meshroom/ui/commands.py b/meshroom/ui/commands.py
index f0ece7e4..d07a1a88 100644
--- a/meshroom/ui/commands.py
+++ b/meshroom/ui/commands.py
@@ -168,18 +168,23 @@ class ListAttributeAppendCommand(GraphCommand):
         assert isinstance(listAttribute, ListAttribute)
         self.attrName = listAttribute.fullName()
         self.index = None
-        self.value = value
+        self.count = 1
+        self.value = value if len(value) else None
         self.setText("Append to {}".format(self.attrName))
 
     def redoImpl(self):
         listAttribute = self.graph.attribute(self.attrName)
-        listAttribute.append(self.value)
-        self.index = len(listAttribute) - 1
+        self.index = len(listAttribute)
+        if isinstance(self.value, list):
+            listAttribute.extend(self.value)
+            self.count = len(self.value)
+        else:
+            listAttribute.append(self.value)
         return True
 
     def undoImpl(self):
         listAttribute = self.graph.attribute(self.attrName)
-        listAttribute.remove(self.index)
+        listAttribute.remove(self.index, self.count)
 
 
 class ListAttributeRemoveCommand(GraphCommand):
diff --git a/meshroom/ui/reconstruction.py b/meshroom/ui/reconstruction.py
index 78d796eb..b8eef887 100755
--- a/meshroom/ui/reconstruction.py
+++ b/meshroom/ui/reconstruction.py
@@ -63,7 +63,11 @@ class Reconstruction(QObject):
 
     @Slot(graph.Attribute, QJsonValue)
     def appendAttribute(self, attribute, value):
-        self._undoStack.tryAndPush(commands.ListAttributeAppendCommand(self._graph, attribute, value.toObject()))
+        if value.isArray():
+            pyValue = value.toArray().toVariantList()
+        else:
+            pyValue = None if value.isNull() else value.toObject()
+        self._undoStack.tryAndPush(commands.ListAttributeAppendCommand(self._graph, attribute, pyValue))
 
     @Slot(graph.Attribute)
     def removeAttribute(self, attribute):