diff --git a/components/lib/cascadeselect/CascadeSelect.vue b/components/lib/cascadeselect/CascadeSelect.vue
index 865eb139e..177ab275a 100644
--- a/components/lib/cascadeselect/CascadeSelect.vue
+++ b/components/lib/cascadeselect/CascadeSelect.vue
@@ -147,7 +147,7 @@ export default {
             return this.optionGroupLabel ? ObjectUtils.resolveFieldData(optionGroup, this.optionGroupLabel) : null;
         },
         getOptionGroupChildren(optionGroup, level) {
-            return ObjectUtils.resolveFieldData(optionGroup, this.optionGroupChildren[level]);
+            return ObjectUtils.isString(this.optionGroupChildren) ? ObjectUtils.resolveFieldData(optionGroup, this.optionGroupChildren) : ObjectUtils.resolveFieldData(optionGroup, this.optionGroupChildren[level]);
         },
         isOptionGroup(option, level) {
             return Object.prototype.hasOwnProperty.call(option, this.optionGroupChildren[level]);
diff --git a/components/lib/cascadeselect/CascadeSelectSub.vue b/components/lib/cascadeselect/CascadeSelectSub.vue
index 73585619b..484daf2fd 100644
--- a/components/lib/cascadeselect/CascadeSelectSub.vue
+++ b/components/lib/cascadeselect/CascadeSelectSub.vue
@@ -73,7 +73,10 @@ export default {
         optionDisabled: null,
         optionGroupIcon: String,
         optionGroupLabel: String,
-        optionGroupChildren: Array,
+        optionGroupChildren: {
+            type: [String, Array],
+            default: null
+        },
         activeOptionPath: Array,
         level: Number,
         templates: null,