diff --git a/src/components/autocomplete/AutoComplete.vue b/src/components/autocomplete/AutoComplete.vue
index 0de56bc4b..2500f5a9e 100755
--- a/src/components/autocomplete/AutoComplete.vue
+++ b/src/components/autocomplete/AutoComplete.vue
@@ -709,7 +709,7 @@ export default {
             return this.isValidOption(option) && this.getOptionLabel(option).toLocaleLowerCase(this.searchLocale) === value.toLocaleLowerCase(this.searchLocale);
         },
         isValidOption(option) {
-            return option && !(this.isOptionDisabled(option) || option.optionGroup);
+            return option && !(this.isOptionDisabled(option) || this.isOptionGroup(option));
         },
         isSelected(option) {
             return ObjectUtils.equals(this.modelValue, this.getOptionValue(option), this.equalityKey);
diff --git a/src/components/dropdown/Dropdown.vue b/src/components/dropdown/Dropdown.vue
index 6d8504bb2..12520e17f 100755
--- a/src/components/dropdown/Dropdown.vue
+++ b/src/components/dropdown/Dropdown.vue
@@ -668,7 +668,7 @@ export default {
             return this.isValidOption(option) && this.getOptionLabel(option).toLocaleLowerCase(this.filterLocale).startsWith(this.searchValue.toLocaleLowerCase(this.filterLocale));
         },
         isValidOption(option) {
-            return option && !(this.isOptionDisabled(option) || option.optionGroup);
+            return option && !(this.isOptionDisabled(option) || this.isOptionGroup(option));
         },
         isValidSelectedOption(option) {
             return this.isValidOption(option) && this.isSelected(option);
diff --git a/src/components/listbox/Listbox.vue b/src/components/listbox/Listbox.vue
index ba5f48142..599a58bf6 100755
--- a/src/components/listbox/Listbox.vue
+++ b/src/components/listbox/Listbox.vue
@@ -493,7 +493,7 @@ export default {
             return this.isValidOption(option) && this.getOptionLabel(option).toLocaleLowerCase(this.filterLocale).startsWith(this.searchValue.toLocaleLowerCase(this.filterLocale));
         },
         isValidOption(option) {
-            return option && !(this.isOptionDisabled(option) || option.optionGroup);
+            return option && !(this.isOptionDisabled(option) || this.isOptionGroup(option));
         },
         isValidSelectedOption(option) {
             return this.isValidOption(option) && this.isSelected(option);
diff --git a/src/components/multiselect/MultiSelect.vue b/src/components/multiselect/MultiSelect.vue
index b6c146e5a..535e7e8fd 100755
--- a/src/components/multiselect/MultiSelect.vue
+++ b/src/components/multiselect/MultiSelect.vue
@@ -783,7 +783,7 @@ export default {
             return this.isValidOption(option) && this.getOptionLabel(option).toLocaleLowerCase(this.filterLocale).startsWith(this.searchValue.toLocaleLowerCase(this.filterLocale));
         },
         isValidOption(option) {
-            return option && !(this.isOptionDisabled(option) || option.optionGroup);
+            return option && !(this.isOptionDisabled(option) || this.isOptionGroup(option));
         },
         isValidSelectedOption(option) {
             return this.isValidOption(option) && this.isSelected(option);