diff --git a/services/static-webserver/client/source/class/osparc/data/model/Study.js b/services/static-webserver/client/source/class/osparc/data/model/Study.js
index a0777d034b43..f95c17a80493 100644
--- a/services/static-webserver/client/source/class/osparc/data/model/Study.js
+++ b/services/static-webserver/client/source/class/osparc/data/model/Study.js
@@ -699,14 +699,12 @@ qx.Class.define("osparc.data.model.Study", {
     /**
      * Call patch Study, but the changes were already applied on the frontend
      * @param studyDiffs {Object} Diff Object coming from the JsonDiffPatch lib. Use only the keys, not the changes.
-     * @param sourceStudy {Object} Study object that was used to apply the diffs on the frontend.
+     * @param studySource {Object} Study object that was used to check the diffs on the frontend.
      */
-    patchStudyDelayed: function(studyDiffs, sourceStudy) {
+    patchStudyDelayed: function(studyDiffs, studySource) {
       const promises = [];
-      let workbenchDiffs = {};
       if ("workbench" in studyDiffs) {
-        workbenchDiffs = studyDiffs["workbench"];
-        promises.push(this.getWorkbench().patchWorkbenchDelayed(workbenchDiffs));
+        promises.push(this.getWorkbench().patchWorkbenchDelayed(studyDiffs["workbench"], studySource["workbench"]));
         delete studyDiffs["workbench"];
       }
       const fieldKeys = Object.keys(studyDiffs);
@@ -731,7 +729,7 @@ qx.Class.define("osparc.data.model.Study", {
       }
       return Promise.all(promises)
         .then(() => {
-          return sourceStudy;
+          return studySource;
         });
     }
   }
diff --git a/services/static-webserver/client/source/class/osparc/data/model/Workbench.js b/services/static-webserver/client/source/class/osparc/data/model/Workbench.js
index 02917b2730e7..3e0d3eea769a 100644
--- a/services/static-webserver/client/source/class/osparc/data/model/Workbench.js
+++ b/services/static-webserver/client/source/class/osparc/data/model/Workbench.js
@@ -784,8 +784,9 @@ qx.Class.define("osparc.data.model.Workbench", {
     /**
      * Call patch Node, but the changes were already applied on the frontend
      * @param workbenchDiffs {Object} Diff Object coming from the JsonDiffPatch lib. Use only the keys, not the changes.
+     * @param workbenchSource {Object} Workbench object that was used to check the diffs on the frontend.
      */
-    patchWorkbenchDelayed: function(workbenchDiffs) {
+    patchWorkbenchDelayed: function(workbenchDiffs, workbenchSource) {
       const promises = [];
       Object.keys(workbenchDiffs).forEach(nodeId => {
         const node = this.getNode(nodeId);
@@ -793,12 +794,16 @@ qx.Class.define("osparc.data.model.Workbench", {
           // the node was removed
           return;
         }
+        // use the node data that was used to check the diffs
+        const nodeData = workbenchSource[nodeId];
+        if (!nodeData) {
+          // skip if nodeData is undefined or null
+          return;
+        }
 
-        const nodeData = node.serialize();
         let patchData = {};
         if (workbenchDiffs[nodeId] instanceof Array) {
-          // if workbenchDiffs is an array means that the node was either added or removed
-          // the node was added
+          // if workbenchDiffs is an array means that the node was added
           patchData = nodeData;
         } else {
           // patch only what was changed
diff --git a/services/static-webserver/client/source/class/osparc/desktop/StudyEditor.js b/services/static-webserver/client/source/class/osparc/desktop/StudyEditor.js
index 65f28d23962b..154c1a837861 100644
--- a/services/static-webserver/client/source/class/osparc/desktop/StudyEditor.js
+++ b/services/static-webserver/client/source/class/osparc/desktop/StudyEditor.js
@@ -858,20 +858,18 @@ qx.Class.define("osparc.desktop.StudyEditor", {
 
     __getStudyDiffs: function() {
       const sourceStudy = this.getStudy().serialize();
+      const studyDiffs = {
+        sourceStudy,
+        delta: {},
+      }
       const delta = osparc.wrapper.JsonDiffPatch.getInstance().diff(this.__studyDataInBackend, sourceStudy);
       if (delta) {
         // lastChangeDate and creationDate should not be taken into account as data change
         delete delta["creationDate"];
         delete delta["lastChangeDate"];
-        return {
-          sourceStudy,
-          delta,
-        };
+        studyDiffs.delta = delta;
       }
-      return {
-        sourceStudy,
-        delta: {},
-      };
+      return studyDiffs;
     },
 
     didStudyChange: function() {