diff --git a/source/espresso.js b/source/espresso.js
index 309dbb2bd4..a7e672707d 100644
--- a/source/espresso.js
+++ b/source/espresso.js
@@ -85,7 +85,6 @@ espresso.Graph = class {
     constructor(metadata, reader) {
         this.name = '';
         this.type = reader.type;
-        this.groups = reader.groups;
         for (const value of reader.values.values()) {
             const name = value.name;
             const type = value.type;
@@ -152,9 +151,6 @@ espresso.Node = class {
         if (!obj.type) {
             throw new Error('Undefined node type.');
         }
-        if (obj.group) {
-            this.group = obj.group || null;
-        }
         const type = metadata.type(obj.type);
         this.type = type ? { ...type } : { name: obj.type };
         this.type.name = obj.type.split(':').pop();