diff --git a/lib/delivery-locations-resolver.js b/lib/delivery-locations-resolver.js
index 78ee2bf4..86ac983d 100644
--- a/lib/delivery-locations-resolver.js
+++ b/lib/delivery-locations-resolver.js
@@ -138,10 +138,11 @@ class DeliveryLocationsResolver {
       const ellapsed = ((new Date()) - __startAll)
       logger.debug({ message: `HTC searchByParam API across ${barcodes.length} barcodes took ${ellapsed}ms total`, metric: 'searchByParam-barcode-multiple', timeMs: ellapsed })
 
-      // Filter out anything `undefined` and make sure at least one is valid:
-      const validPairs = [{}].concat(scsbResponses.filter((r) => r))
-      // Merge array of hashes into one big lookup hash:
-      return Object.assign.apply(null, validPairs)
+      // Build barcode-customerCode map:
+      return barcodes.reduce((h, barcode, ind) => {
+        if (scsbResponses[ind]) h[barcode] = scsbResponses[ind]
+        return h
+      }, {})
     })
   }