diff --git a/angular-drag-and-drop-lists.js b/angular-drag-and-drop-lists.js
index 8a07ce3..527ee2a 100644
--- a/angular-drag-and-drop-lists.js
+++ b/angular-drag-and-drop-lists.js
@@ -336,8 +336,15 @@
             } else {
               var isFirstHalf = event.clientY < rect.top + rect.height / 2;
             }
-            listNode.insertBefore(placeholderNode,
-                isFirstHalf ? listItemNode : listItemNode.nextSibling);
+            if(isFirstHalf) {
+              if(listItemNode.previousSibling != placeholderNode) {
+                listNode.insertBefore(placeholderNode, listItemNode);
+              }
+            } else {
+              if(listItemNode.nextSibling != placeholderNode) {
+                listNode.insertBefore(placeholderNode, listItemNode.nextSibling);
+              }
+            }
           }
         }
 
diff --git a/package.json b/package.json
index d979eaa..211544f 100644
--- a/package.json
+++ b/package.json
@@ -5,7 +5,6 @@
     "description": "Angular directives for sorting nested lists using the HTML5 Drag and Drop API",
     "repository": "https://github.com/marceljuenemann/angular-drag-and-drop-lists",
     "license": "MIT",
-    "main": "angular-drag-and-drop-lists.js",
     "devDependencies": {
         "angular": "~1.4.9",
         "angular-mocks": "~1.4.9",