diff --git a/src/tiled/changeimagelayerproperty.h b/src/tiled/changeimagelayerproperty.h
index eb30688c32..ced9ed661a 100644
--- a/src/tiled/changeimagelayerproperty.h
+++ b/src/tiled/changeimagelayerproperty.h
@@ -39,6 +39,8 @@ class ChangeImageLayerTransparentColor : public ChangeValue<ImageLayer, QColor>
                                      QList<ImageLayer *> imageLayers,
                                      const QColor &newColor);
 
+    int id() const override { return Cmd_ChangeImageLayerTransparentColor; }
+
 private:
     QColor getValue(const ImageLayer *imageLayer) const override;
     void setValue(ImageLayer *imageLayer, const QColor &value) const override;
@@ -51,6 +53,8 @@ class ChangeImageLayerImageSource : public ChangeValue<ImageLayer, QUrl>
                                 QList<ImageLayer *> imageLayers,
                                 const QUrl &imageSource);
 
+    int id() const override { return Cmd_ChangeImageLayerImageSource; }
+
 private:
     QUrl getValue(const ImageLayer *imageLayer) const override;
     void setValue(ImageLayer *imageLayer, const QUrl &value) const override;
diff --git a/src/tiled/changeobjectgroupproperties.h b/src/tiled/changeobjectgroupproperties.h
index 926bde9ede..7cfb9dad92 100644
--- a/src/tiled/changeobjectgroupproperties.h
+++ b/src/tiled/changeobjectgroupproperties.h
@@ -42,6 +42,8 @@ class ChangeObjectGroupColor : public ChangeValue<ObjectGroup, QColor>
                            QList<ObjectGroup *> objectGroups,
                            const QColor &newColor);
 
+    int id() const override { return Cmd_ChangeObjectGroupColor; }
+
 private:
     QColor getValue(const ObjectGroup *objectGroup) const override;
     void setValue(ObjectGroup *objectGroup, const QColor &value) const override;
@@ -61,6 +63,8 @@ class ChangeObjectGroupDrawOrder : public ChangeValue<ObjectGroup, ObjectGroup::
                                QList<ObjectGroup *> objectGroups,
                                ObjectGroup::DrawOrder newDrawOrder);
 
+    int id() const override { return Cmd_ChangeObjectGroupDrawOrder; }
+
 private:
     ObjectGroup::DrawOrder getValue(const ObjectGroup *objectGroup) const override;
     void setValue(ObjectGroup *objectGroup, const ObjectGroup::DrawOrder &value) const override;
diff --git a/src/tiled/propertieswidget.cpp b/src/tiled/propertieswidget.cpp
index 0474975fc1..773afe04b2 100644
--- a/src/tiled/propertieswidget.cpp
+++ b/src/tiled/propertieswidget.cpp
@@ -1125,7 +1125,7 @@ class LayerProperties : public ObjectProperties
     template <class T>
     QList<T*> selectedLayersOfType(Layer::TypeFlag typeFlag)
     {
-        if (mDocument)
+        if (!mDocument)
             return {};
 
         QList<T*> result;
@@ -1212,9 +1212,8 @@ class ImageLayerProperties : public LayerProperties
             emit mImageProperty->valueChanged();
         if (layerChange.properties & ImageLayerChangeEvent::TransparentColorProperty)
             emit mTransparentColorProperty->valueChanged();
-        if (layerChange.properties & ImageLayerChangeEvent::RepeatProperty) {
+        if (layerChange.properties & ImageLayerChangeEvent::RepeatProperty)
             emit mRepeatProperty->valueChanged();
-        }
     }
 
     ImageLayer *imageLayer() const
diff --git a/src/tiled/undocommands.h b/src/tiled/undocommands.h
index 32abbda596..c84e761624 100644
--- a/src/tiled/undocommands.h
+++ b/src/tiled/undocommands.h
@@ -30,8 +30,10 @@ namespace Tiled {
  */
 enum UndoCommands {
     Cmd_ChangeClassName,
+    Cmd_ChangeImageLayerImageSource,
     Cmd_ChangeImageLayerRepeatX,
     Cmd_ChangeImageLayerRepeatY,
+    Cmd_ChangeImageLayerTransparentColor,
     Cmd_ChangeLayerBlendMode,
     Cmd_ChangeLayerLocked,
     Cmd_ChangeLayerName,
@@ -54,6 +56,8 @@ enum UndoCommands {
     Cmd_ChangeMapStaggerAxis,
     Cmd_ChangeMapStaggerIndex,
     Cmd_ChangeMapTileSize,
+    Cmd_ChangeObjectGroupColor,
+    Cmd_ChangeObjectGroupDrawOrder,
     Cmd_ChangeSelectedArea,
     Cmd_ChangeTileImageRect,
     Cmd_ChangeTileProbability,