1 files changed, 11 insertions, 1 deletions
diff --git a/lib/sfIsisImporterRelations.class.php b/lib/sfIsisImporterRelations.class.php
index bf41120..248bf99 100644
--- a/lib/sfIsisImporterRelations.class.php
+++ b/lib/sfIsisImporterRelations.class.php
@@ -151,9 +151,19 @@ class sfIsisImporterRelations extends sfIsisImporterEntities {
    */
   public function addManyToManyEntities(&$model, array $values, $relation, $key = 'name')
   {
+    $existing = array();
+
     foreach ($values as $value)
     {
-      $this->addManyToMany($model, $value, $relation, $key);
+      // Prevent duplicate entries.
+      if (!in_array($value, $existing))
+      {
+        $existing[] = $value;
+        $this->addManyToMany($model, $value, $relation, $key);
+      }
+      else {
+        $this->log("Found duplicate entry $value for relation $key.", 'debug');
+      }
     }
   }