From 7025cce3f4ca0017c9ce7216e45318d6fa9006ed Mon Sep 17 00:00:00 2001
From: zhongwuzw <zhongwuzw@qq.com>
Date: Sun, 3 Mar 2019 20:26:54 -0800
Subject: [PATCH] Fixed crash if event doesn't have body parameter (#23711)

Summary:
We need to check `body[@"target"]` wether equal to `nil`, if it is, return to prevent crash.

[iOS] [Fixed] - Fixed crash if event doesn't have body parameter
Pull Request resolved: https://github.com/facebook/react-native/pull/23711

Differential Revision: D14298543

Pulled By: cpojer

fbshipit-source-id: d5e8cd69438f323ae102e61618c0371a01bee347
---
 React/Base/RCTEventDispatcher.m | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/React/Base/RCTEventDispatcher.m b/React/Base/RCTEventDispatcher.m
index 4e05e2b43e..9530b5a225 100644
--- a/React/Base/RCTEventDispatcher.m
+++ b/React/Base/RCTEventDispatcher.m
@@ -85,11 +85,15 @@ RCT_EXPORT_MODULE()
     RCTAssert([body[@"target"] isKindOfClass:[NSNumber class]],
       @"Event body dictionary must include a 'target' property containing a React tag");
   }
+  
+  if (!body[@"target"]) {
+    return;
+  }
 
   name = RCTNormalizeInputEventName(name);
   [_bridge enqueueJSCall:@"RCTEventEmitter"
                   method:@"receiveEvent"
-                    args:body ? @[body[@"target"], name, body] : @[body[@"target"], name]
+                    args:@[body[@"target"], name, body]
               completion:NULL];
 }