From 8ae063dec8637c82fa1aada6ccdff089a6d3a706 Mon Sep 17 00:00:00 2001
From: Li Tan <lit@fb.com>
Date: Thu, 22 Jan 2015 12:21:30 -0800
Subject: [PATCH] Add check for willDeleteSections:

---
 AsyncDisplayKit/Details/ASRangeController.mm | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/AsyncDisplayKit/Details/ASRangeController.mm b/AsyncDisplayKit/Details/ASRangeController.mm
index 737f7ad1cc..db354aef77 100644
--- a/AsyncDisplayKit/Details/ASRangeController.mm
+++ b/AsyncDisplayKit/Details/ASRangeController.mm
@@ -294,7 +294,9 @@
 
 - (void)dataController:(ASDataController *)dataController willDeleteSectionsAtIndexSet:(NSIndexSet *)indexSet withAnimationOption:(ASDataControllerAnimationOptions)animationOption {
   ASDisplayNodePerformBlockOnMainThread(^{
+    if ([_delegate respondsToSelector:@selector(rangeController:willDeleteSectionsAtIndexSet:withAnimationOption:)]) {
       [_delegate rangeController:self willDeleteSectionsAtIndexSet:indexSet withAnimationOption:animationOption];
+    }
   });
 }