diff --git a/static/src/app/pos_loyalty_safe_coupon_patch.js b/static/src/app/pos_loyalty_safe_coupon_patch.js
index f2b7d1a..a76a487 100644
--- a/static/src/app/pos_loyalty_safe_coupon_patch.js
+++ b/static/src/app/pos_loyalty_safe_coupon_patch.js
@@ -74,25 +74,6 @@ patch(PosOrder.prototype, {
         });
     },
 
-    /**
-     * getLoyaltyPoints reads coupon_id.id — guard undefined coupon_id.
-     */
-    getLoyaltyPoints() {
-        const undefinedCouponLines = [];
-        for (const line of this._get_reward_lines()) {
-            if (!line.coupon_id) {
-                line.coupon_id = { id: 0 };
-                undefinedCouponLines.push(line);
-            }
-        }
-        try {
-            return super.getLoyaltyPoints(...arguments);
-        } finally {
-            for (const line of undefinedCouponLines) {
-                line.coupon_id = undefined;
-            }
-        }
-    },
 
     /**
      * _updateRewardLines — purge orphans before core re-processes them.
@@ -104,7 +85,7 @@ patch(PosOrder.prototype, {
 
     /**
      * _validForPointsCorrection — core accesses reward.program_id.id without null check.
-     * Guard it here.
+     * Guard it here. This also guards the lines accessed in _getPointsCorrection.
      */
     _validForPointsCorrection(reward, line, rule) {
         if (!reward || !reward.program_id || !rule.program_id) {
@@ -113,28 +94,21 @@ patch(PosOrder.prototype, {
         return super._validForPointsCorrection(...arguments);
     },
 
-    _getPointsCorrection(program) {
-        if (!program || !program.rule_ids) {
-            return 0;
-        }
-        const originalLines = this.lines;
-        this.lines = this.lines.filter(
-            (line) => !(line.is_reward_line && (!line.reward_id || !line.reward_id.program_id))
-        );
-        try {
-            return super._getPointsCorrection(...arguments);
-        } finally {
-            this.lines = originalLines;
-        }
-    },
-
+    /**
+     * _get_reward_lines — exclude orphaned reward lines (no valid reward_id.program_id).
+     * This also protects _getPointsCorrection which iterates this.lines.filter(is_reward_line).
+     * NOTE: Do NOT reassign this.lines — that goes through the ORM setter and permanently
+     * mutates/destroys lines. Instead, filter at the method level.
+     */
     _get_reward_lines() {
         const rewardLines = super._get_reward_lines(...arguments);
         if (!rewardLines) {
             return [];
         }
+        // Exclude orphaned lines with missing reward_id.program_id OR missing coupon_id.
+        // getLoyaltyPoints accesses line.coupon_id.id which crashes if coupon_id is undefined.
         return rewardLines.filter(
-            (line) => line.reward_id && line.reward_id.program_id
+            (line) => line.reward_id && line.reward_id.program_id && line.coupon_id
         );
     },
 
@@ -169,20 +143,12 @@ patch(PosOrder.prototype, {
 
 patch(OrderPaymentValidation.prototype, {
     async validateOrder(isForceValidate) {
-        const undefinedCouponLines = [];
-        for (const line of this.order._get_reward_lines()) {
-            if (!line.coupon_id) {
-                line.coupon_id = { id: 0 };
-                undefinedCouponLines.push(line);
-            }
-        }
-        try {
-            return await super.validateOrder(...arguments);
-        } finally {
-            for (const line of undefinedCouponLines) {
-                line.coupon_id = undefined;
-            }
+        // Purge any orphaned reward lines before validation to prevent crashes
+        // in confirm_coupon_programs when it iterates reward lines.
+        if (this.order) {
+            purgeOrphanedRewardLines(this.order);
         }
+        return await super.validateOrder(...arguments);
     },
 });
 
@@ -237,14 +203,6 @@ patch(PosStore.prototype, {
     async postProcessLoyalty(order) {
         purgeOrphanedRewardLines(order);
 
-        const undefinedCouponLines = [];
-        for (const line of order._get_reward_lines()) {
-            if (!line.coupon_id) {
-                line.coupon_id = { id: 0 };
-                undefinedCouponLines.push(line);
-            }
-        }
-
         const originalCall = this.data.call;
         this.data.call = function (model, method, args) {
             if (model === "pos.order" && method === "confirm_coupon_programs") {
@@ -260,9 +218,6 @@ patch(PosStore.prototype, {
             return await super.postProcessLoyalty(...arguments);
         } finally {
             this.data.call = originalCall;
-            for (const line of undefinedCouponLines) {
-                line.coupon_id = undefined;
-            }
         }
     },
 });