diff --git a/src/components/multiselect/MultiSelect.vue b/src/components/multiselect/MultiSelect.vue
index 0aa6c87f2..b4c7117ca 100755
--- a/src/components/multiselect/MultiSelect.vue
+++ b/src/components/multiselect/MultiSelect.vue
@@ -560,7 +560,14 @@ export default {
                 else if (this.visibleOptions) {
                     if (this.optionGroupLabel) {
                         value = [];
-                        this.visibleOptions.forEach(optionGroup => value = [...value, ...this.getOptionGroupChildren(optionGroup)]);
+                        if (this.optionGroupLabel) {
+                            value = [];
+                            this.visibleOptions.forEach(optionGroup => {
+                                for (let option of this.getOptionGroupChildren(optionGroup)) {
+                                    value.push(this.getOptionValue(option));
+                                }
+                            });
+                        }
                     }
                     else  {
                         value = this.visibleOptions.map(option => this.getOptionValue(option));
@@ -597,7 +604,7 @@ export default {
         }
     },
     computed: {
-         visibleOptions() {
+        visibleOptions() {
             if (this.filterValue) {
                 if (this.optionGroupLabel) {
                     let filteredGroups = [];