Made migrations non-destructive; fixed currency migration.

1 files changed, 10 insertions, 7 deletions

diff --git a/app/scripts/migrations/004.js b/app/scripts/migrations/004.js
index 0f9850208..405d932f8 100644
--- a/app/scripts/migrations/004.js
+++ b/app/scripts/migrations/004.js
@@ -1,25 +1,28 @@
 const version = 4
 
+const clone = require('clone')
+
 module.exports = {
-  version,  
+  version,
 
   migrate: function (versionedData) {
-    versionedData.meta.version = version
+    let safeVersionedData = clone(versionedData)
+    safeVersionedData.meta.version = version
     try {
-      if (versionedData.data.config.provider.type !== 'rpc') return Promise.resolve(versionedData)
-      switch (versionedData.data.config.provider.rpcTarget) {
+      if (safeVersionedData.data.config.provider.type !== 'rpc') return Promise.resolve(safeVersionedData)
+      switch (safeVersionedData.data.config.provider.rpcTarget) {
         case 'https://testrpc.metamask.io/':
-          versionedData.data.config.provider = {
+          safeVersionedData.data.config.provider = {
             type: 'testnet',
           }
           break
         case 'https://rpc.metamask.io/':
-          versionedData.data.config.provider = {
+          safeVersionedData.data.config.provider = {
             type: 'mainnet',
           }
           break
       }
     } catch (_) {}
-    return Promise.resolve(versionedData)
+    return Promise.resolve(safeVersionedData)
   },
 }