diff --git a/lib/cash-out/cash-out-low.js b/lib/cash-out/cash-out-low.js
index 210270af..91130119 100644
--- a/lib/cash-out/cash-out-low.js
+++ b/lib/cash-out/cash-out-low.js
@@ -2,13 +2,14 @@ const _ = require('lodash/fp')
 const pgp = require('pg-promise')()
 
 const helper = require('./cash-out-helper')
+const { anonymousCustomer } = require('../constants')
 
 const toDb = helper.toDb
 const toObj = helper.toObj
 
 const UPDATEABLE_FIELDS = ['txHash', 'txVersion', 'status', 'dispense', 'dispenseConfirmed',
   'notified', 'redeem', 'phone', 'error', 'swept', 'publishedAt', 'confirmedAt', 'errorCode',
-  'receivedCryptoAtoms', 'walletScore' ]
+  'receivedCryptoAtoms', 'walletScore', 'customerId' ]
 
 module.exports = {upsert, update, insert}
 
@@ -52,7 +53,15 @@ function diff (oldTx, newTx) {
     // We never null out an existing field
     if (oldTx && _.isNil(newTx[fieldKey])) return
 
-    updatedTx[fieldKey] = newTx[fieldKey]
+    switch (fieldKey) {
+      case 'customerId':
+        if (oldTx.customerId === anonymousCustomer.uuid) {
+          return updatedTx['customerId'] = newTx['customerId']
+        }
+        return
+      default:
+        return updatedTx[fieldKey] = newTx[fieldKey]
+    }
   })
 
   return updatedTx