diff --git a/EditorGroup.js b/EditorGroup.js
index e603def..1cbfc3b 100644
--- a/EditorGroup.js
+++ b/EditorGroup.js
@@ -63,7 +63,9 @@ class EditorGroup extends EditorEntryBase {
   static unserialize(ser) {
     let group = new EditorGroup();
     group.nodes_.clear();
-    group.setLabel(ser.label);
+    if (ser.label != null) {
+      group.setLabel(ser.label);
+    }
     group.nodes_.unserialize(ser.members);
     return group.getElement();
   }
diff --git a/EditorLink.js b/EditorLink.js
index 9006ae4..0812c6e 100644
--- a/EditorLink.js
+++ b/EditorLink.js
@@ -69,7 +69,9 @@ class EditorLink extends EditorEntryBase {
   static unserialize(ser) {
     let link = new EditorLink();
     link.nodes_.clear();
-    link.setLabel(ser.label);
+    if (ser.label != null) {
+      link.setLabel(ser.label);
+    }
     link.nodes_.unserialize([ser.from, ser.to]);
     return link.getElement();
   }