diff --git a/src/layouts/quote/quote.vue b/src/layouts/quote/quote.vue
index abf68247c..8d86c16af 100644
--- a/src/layouts/quote/quote.vue
+++ b/src/layouts/quote/quote.vue
@@ -939,9 +939,12 @@ export default {
             const windshieldString = "WINDSHIELD";
             this.lineItems.glassParts.forEach((part, index) => {
                 if (part.partType === windshieldString) {
-                    this.lineItems.glassParts[index] = this.alternateGlassPartsForOem.find(
+                    let altPartToUse = this.alternateGlassPartsForOem.find(
                         (altPart) => altPart.partType === windshieldString
                     );
+                    if (altPartToUse) {
+                        this.lineItems.glassParts[index] = altPartToUse;
+                    }
                 }
             });
         },