diff --git a/src/components/FormModel.vue b/src/components/FormModel.vue
index d2f346382..54c41f77e 100644
--- a/src/components/FormModel.vue
+++ b/src/components/FormModel.vue
@@ -111,7 +111,7 @@ const isLoading = ref(false);
 // Si elegimos observar los cambios del form significa que inicialmente las actions estaran deshabilitadas
 const isResetting = ref(false);
 const hasChanges = ref(!$props.observeFormChanges);
-const originalData = computed(() => state.get(modelValue));
+const originalData = computed(() => state.get(modelValue) ?? {});
 const formData = ref();
 const defaultButtons = computed(() => ({
     save: {
diff --git a/src/filters/getDifferences.js b/src/filters/getDifferences.js
index 54a82420b..5a1c42b97 100644
--- a/src/filters/getDifferences.js
+++ b/src/filters/getDifferences.js
@@ -1,16 +1,10 @@
 export default function getDifferences(initialData, formData) {
     const differences = {};
-    delete initialData.$index;
-    delete formData.$index;
-
+    if (initialData) delete initialData.$index;
+    if (formData) delete formData.$index;
     for (const key in formData) {
         if (formData.hasOwnProperty(key)) {
-            if (
-                !initialData ||
-                !initialData.hasOwnProperty(key) ||
-                formData[key] !== initialData[key]
-            ) {
-                //Añadir la diferencia solo si existe initialData
+            if (!initialData.hasOwnProperty(key) || formData[key] !== initialData[key]) {
                 if (initialData) {
                     differences[key] = formData[key];
                 }