From bf899d40a0f1c46a4c586f0b476922ca307b3fce Mon Sep 17 00:00:00 2001
From: Lawrence Forman <me@merklejerk.com>
Date: Thu, 3 Sep 2020 13:39:30 -0400
Subject: [PATCH] `@0x/contracts-zero-ex`: Only deploy `FlashWallet` in
 `TransformERC20` migration if it does not already exist.

---
 .../zero-ex/contracts/src/features/TransformERC20Feature.sol | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/contracts/zero-ex/contracts/src/features/TransformERC20Feature.sol b/contracts/zero-ex/contracts/src/features/TransformERC20Feature.sol
index d09f597962..fa77fba85a 100644
--- a/contracts/zero-ex/contracts/src/features/TransformERC20Feature.sol
+++ b/contracts/zero-ex/contracts/src/features/TransformERC20Feature.sol
@@ -76,7 +76,10 @@ contract TransformERC20Feature is
         _registerFeatureFunction(this.getQuoteSigner.selector);
         _registerFeatureFunction(this.transformERC20.selector);
         _registerFeatureFunction(this._transformERC20.selector);
-        this.createTransformWallet();
+        if (this.getTransformWallet() == IFlashWallet(address(0))) {
+            // Create the transform wallet if it doesn't exist.
+            this.createTransformWallet();
+        }
         LibTransformERC20Storage.getStorage().transformerDeployer = transformerDeployer;
         return LibMigrate.MIGRATE_SUCCESS;
     }