diff --git a/api/js/etemplate/Et2Select/Et2Select.ts b/api/js/etemplate/Et2Select/Et2Select.ts
index f7398afd47..864838bee1 100644
--- a/api/js/etemplate/Et2Select/Et2Select.ts
+++ b/api/js/etemplate/Et2Select/Et2Select.ts
@@ -241,7 +241,7 @@ export class Et2Select extends Et2InvokerMixin(Et2WidgetWithSelect)
 
 		if(changedProperties.has('select_options') || changedProperties.has("value") || changedProperties.has('empty_label'))
 		{
-			const valueArray = Array.isArray(this.value) ? this.value : this.value.split(',');
+			const valueArray = Array.isArray(this.value) ? this.value : (!this.value ? [] : this.value.toString().split(','));
 			// value not in options AND NOT (having an empty label and value)
 			if(this.select_options.length > 0 && this.select_options.filter((option) => valueArray.find(val => val == option.value)).length === 0 &&
 				!(typeof this.empty_label !== 'undefined' && (this.value || "") === ""))