diff --git a/lib/cash-out/cash-out-low.js b/lib/cash-out/cash-out-low.js
index 2772374f..91130119 100644
--- a/lib/cash-out/cash-out-low.js
+++ b/lib/cash-out/cash-out-low.js
@@ -2,6 +2,7 @@ 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
@@ -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