diff --git a/src/Migration/Cache.php b/src/Migration/Cache.php
index 3e836947..3651bae7 100644
--- a/src/Migration/Cache.php
+++ b/src/Migration/Cache.php
@@ -27,13 +27,17 @@ public function __construct()
     }
 
     /**
-     * Get cache key for a resource
+     * Get cache key from resource
      *
      * @param Resource $resource
      * @return string
-     */
-    public function getResourceCacheKey(Resource $resource): string
+    */
+    public function resolveResourceCacheKey(Resource $resource): string
     {
+        if (! $resource->getSequence()) {
+            $resource->setSequence(uniqid());
+        }
+
         $resourceName = $resource->getName();
         $keys = [];
 
@@ -83,15 +87,7 @@ public function getResourceCacheKey(Resource $resource): string
      */
     public function add(Resource $resource): void
     {
-        if (! $resource->getSequence()) {
-            $resourceId = uniqid();
-            if (isset($this->cache[$resource->getName()][$resourceId])) {
-                $resourceId = uniqid();
-                // todo: $resourceId is not used?
-            }
-            $resource->setSequence(uniqid());
-        }
-        $key = $this->getResourceCacheKey($resource);
+        $key = $this->resolveResourceCacheKey($resource);
         if ($resource->getName() == Resource::TYPE_ROW || $resource->getName() == Resource::TYPE_DOCUMENT) {
             $status = $resource->getStatus();
             $this->cache[$resource->getName()][$key] = $status;
@@ -130,7 +126,7 @@ public function addAll(array $resources): void
      */
     public function update(Resource $resource): void
     {
-        $key = $this->getResourceCacheKey($resource);
+        $key = $this->resolveResourceCacheKey($resource);
         // if rows then updating the status counter only
         if ($resource->getName() == Resource::TYPE_ROW || $resource->getName() == Resource::TYPE_DOCUMENT) {
             if (!isset($this->cache[$resource->getName()][$key])) {
@@ -171,7 +167,7 @@ public function updateAll(array $resources): void
      */
     public function remove(Resource $resource): void
     {
-        $key = $this->getResourceCacheKey($resource);
+        $key = $this->resolveResourceCacheKey($resource);
         if ($resource->getName() == Resource::TYPE_ROW || $resource->getName() == Resource::TYPE_DOCUMENT) {
             if (! isset($this->cache[$resource->getName()][$key])) {
                 throw new \Exception('Resource does not exist in cache');