diff --git a/LXReorderableCollectionViewFlowLayout/LXReorderableCollectionViewFlowLayout.m b/LXReorderableCollectionViewFlowLayout/LXReorderableCollectionViewFlowLayout.m
index a34964b..c1219b5 100755
--- a/LXReorderableCollectionViewFlowLayout/LXReorderableCollectionViewFlowLayout.m
+++ b/LXReorderableCollectionViewFlowLayout/LXReorderableCollectionViewFlowLayout.m
@@ -149,7 +149,7 @@ - (void)invalidateLayoutIfNecessary {
     NSIndexPath *newIndexPath = [self.collectionView indexPathForItemAtPoint:self.currentView.center];
     NSIndexPath *previousIndexPath = self.selectedItemIndexPath;
     
-    if ((newIndexPath == nil) || [newIndexPath isEqual:previousIndexPath]) {
+    if ((newIndexPath == nil) || (previousIndexPath == nil) || [newIndexPath isEqual:previousIndexPath]) {
         return;
     }