From bafd59283fbd9b337359b0e52beccb83c56763aa Mon Sep 17 00:00:00 2001
From: Elliot Hesp <elliot.hesp@gmail.com>
Date: Fri, 16 Jun 2017 08:39:16 +0100
Subject: [PATCH] [ios][database] Prevent null value being passed to JSEvent

---
 ios/RNFirebase/RNFirebaseDatabase.m | 1 +
 1 file changed, 1 insertion(+)

diff --git a/ios/RNFirebase/RNFirebaseDatabase.m b/ios/RNFirebase/RNFirebaseDatabase.m
index 497f6e38..2add26cb 100644
--- a/ios/RNFirebase/RNFirebaseDatabase.m
+++ b/ios/RNFirebase/RNFirebaseDatabase.m
@@ -33,6 +33,7 @@
     if (!_listeners[listenerId]) {
         id andPreviousSiblingKeyWithBlock = ^(FIRDataSnapshot *_Nonnull snapshot, NSString *_Nullable previousChildName) {
             NSDictionary *props = [RNFirebaseDBReference snapshotToDict:snapshot];
+            if (previousChildName == nil) previousChildName = @"";
             [self sendJSEvent:DATABASE_DATA_EVENT title:eventName props:@{@"eventName": eventName, @"refId": _refId, @"listenerId": listenerId, @"path": _path, @"snapshot": props, @"previousChildName":previousChildName}];
         };
         id errorBlock = ^(NSError *_Nonnull error) {