Update user.ts

Author: neSpecc

src/models/user.ts

@@ -371,9 +371,16 @@ export default class UserModel extends AbstractModel<UserDBScheme> implements Us
     const res = [];
 
     if (ids.length === 0) {
+      if (!this.workspaces) {
+        return [];
+      }
       return Object.keys(this.workspaces);
     }
 
+    if (!this.workspaces) {
+      return [];
+    }
+
     for (const id of ids) {
       const workspaceId = id.toString();
       const workspace = this.workspaces[workspaceId];