diff --git a/package-lock.json b/package-lock.json
index cde9c02..195fe2f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,7 +9,7 @@
       "version": "4.44.0",
       "license": "UNLICENSED",
       "dependencies": {
-        "@epilot/pricing-client": "^3.35.15",
+        "@epilot/pricing-client": "^3.35.17",
         "@types/dinero.js": "^1.9.0",
         "dinero.js": "^1.9.1"
       },
@@ -825,9 +825,9 @@
       }
     },
     "node_modules/@epilot/pricing-client": {
-      "version": "3.35.15",
-      "resolved": "https://registry.npmjs.org/@epilot/pricing-client/-/pricing-client-3.35.15.tgz",
-      "integrity": "sha512-klS4anO4I4ygBR/c6T18cl+LzJUkhVchrE1UGhK2e4GgZr0jvnsdteWoUgXuO2+UP4CmaC1bXFdufN1IpRlX0w==",
+      "version": "3.35.17",
+      "resolved": "https://registry.npmjs.org/@epilot/pricing-client/-/pricing-client-3.35.17.tgz",
+      "integrity": "sha512-Zs7S0rLAeOaTs6pHtC/87SO22xev1b86DOcY4L4jJf8nO/oiYziPqNcqeW2hHKSJiehf70jn3X0c/J2RrTRJiQ==",
       "dependencies": {
         "@dazn/lambda-powertools-correlation-ids": "^1.28.1",
         "buffer": "^6.0.3",
diff --git a/package.json b/package.json
index 26bc0c4..caae596 100644
--- a/package.json
+++ b/package.json
@@ -54,7 +54,7 @@
   "author": "epilot GmbH",
   "license": "UNLICENSED",
   "dependencies": {
-    "@epilot/pricing-client": "^3.35.15",
+    "@epilot/pricing-client": "^3.35.17",
     "@types/dinero.js": "^1.9.0",
     "dinero.js": "^1.9.1"
   },
diff --git a/src/pricing.ts b/src/pricing.ts
index bf469b8..563429d 100644
--- a/src/pricing.ts
+++ b/src/pricing.ts
@@ -453,6 +453,8 @@ const recomputeDetailTotals = (
     typeof priceItemToAppend.cashback_amount !== 'undefined'
       ? toDineroFromInteger(priceItemToAppend.cashback_amount!)
       : undefined;
+
+  const cashbackPeriod = priceItemToAppend.cashback_period;
   const priceBeforeDiscountAmountTotal =
     typeof priceItemToAppend.before_discount_amount_total !== 'undefined'
       ? toDineroFromInteger(priceItemToAppend.before_discount_amount_total!)
@@ -564,13 +566,12 @@ const recomputeDetailTotals = (
   }
 
   // Cashback totals
-  if (priceCashBackAmount) {
-    const cashbackPeriod = priceItemToAppend.cashback_period;
+  if (priceCashBackAmount && cashbackPeriod !== undefined) {
     const cashbackMatchIndex = cashbacks.findIndex((cashback) => cashback.cashback_period === cashbackPeriod);
 
     if (cashbackMatchIndex !== -1) {
-      const matchingCashback = cashbacks[cashbackMatchIndex]!;
-      const cashbackAmountTotal = toDineroFromInteger(matchingCashback.amount_total!);
+      const matchingCashback = cashbacks[cashbackMatchIndex];
+      const cashbackAmountTotal = toDineroFromInteger(matchingCashback.amount_total);
       matchingCashback.amount_total = cashbackAmountTotal.add(priceCashBackAmount).getAmount();
     } else {
       cashbacks.push({