From 194273f5f50109f21739ab11db944e65cd18f7c0 Mon Sep 17 00:00:00 2001
From: Nick Lockwood <nicklockwood@fb.com>
Date: Fri, 12 Feb 2016 09:27:21 -0800
Subject: [PATCH] Fixed hitTest crash due to sticky header out-of-range

Reviewed By: javache

Differential Revision: D2932227

fb-gh-sync-id: 05d69ec391685dd7e72d3d5f7d56b189a6eab413
shipit-source-id: 05d69ec391685dd7e72d3d5f7d56b189a6eab413
---
 React/Views/RCTScrollView.m | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/React/Views/RCTScrollView.m b/React/Views/RCTScrollView.m
index 10f2e5ec9..4cc9d4bc8 100644
--- a/React/Views/RCTScrollView.m
+++ b/React/Views/RCTScrollView.m
@@ -349,8 +349,14 @@ RCT_NOT_IMPLEMENTED(- (instancetype)init)
 {
   __block UIView *hitView;
 
+  NSArray *subviews = [self contentView].reactSubviews;
+  NSUInteger subviewCount = subviews.count;
   [_stickyHeaderIndices enumerateIndexesWithOptions:0 usingBlock:^(NSUInteger idx, BOOL *stop) {
-    UIView *stickyHeader = [self contentView].reactSubviews[idx];
+    if (idx >= subviewCount) {
+      *stop = YES;
+      return;
+    }
+    UIView *stickyHeader = subviews[idx];
     CGPoint convertedPoint = [stickyHeader convertPoint:point fromView:self];
     hitView = [stickyHeader hitTest:convertedPoint withEvent:event];
     *stop = (hitView != nil);