diff --git a/POS/src/components/sale/CouponDialog.vue b/POS/src/components/sale/CouponDialog.vue
index 65ab34de..5bd94671 100644
--- a/POS/src/components/sale/CouponDialog.vue
+++ b/POS/src/components/sale/CouponDialog.vue
@@ -300,7 +300,7 @@ const couponResource = createResource({
 	makeParams() {
 		return {
 			coupon_code: couponCode.value,
-			customer: props.customer,
+			customer: props.customer || "",
 			company: props.company,
 		};
 	},
@@ -361,6 +361,12 @@ async function applyCoupon() {
 		return;
 	}
 
+	if (!props.customer) {
+		errorMessage.value = __("Please choose a customer");
+		showError(errorMessage.value);
+		return;
+	}
+
 	applying.value = true;
 	errorMessage.value = "";
 
diff --git a/pos_next/api/offers.py b/pos_next/api/offers.py
index 70b48bf2..b219ab23 100644
--- a/pos_next/api/offers.py
+++ b/pos_next/api/offers.py
@@ -602,8 +602,11 @@ def get_active_coupons(customer: str, company: str) -> list[dict]:
 
 
 @frappe.whitelist()
-def validate_coupon(coupon_code: str, customer: str, company: str) -> dict:
+def validate_coupon(coupon_code: str, company: str, customer: str | None = None) -> dict:
 	"""Validate a coupon code and return its details"""
+	if not customer:
+		return {"valid": False, "message": _("Please choose a customer")}
+
 	if not frappe.db.table_exists("POS Coupon"):
 		return {"valid": False, "message": _("Coupons are not enabled")}