From 9ad11dd5698c256b913ca5d7ec4086e427659610 Mon Sep 17 00:00:00 2001
From: Hampton Maxwell <me@hamptonmaxwell.com>
Date: Wed, 20 Jun 2018 15:26:24 -0700
Subject: [PATCH] Avoid crash when text track doesn't have a title or language

---
 ios/RCTVideo.m | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/ios/RCTVideo.m b/ios/RCTVideo.m
index d2cc3114..5fd921cd 100644
--- a/ios/RCTVideo.m
+++ b/ios/RCTVideo.m
@@ -702,13 +702,16 @@ static NSString *const timedMetadata = @"timedMetadata";
                                   mediaSelectionGroupForMediaCharacteristic:AVMediaCharacteristicLegible];
   for (int i = 0; i < group.options.count; ++i) {
     AVMediaSelectionOption *currentOption = [group.options objectAtIndex:i];
-    NSString *title = [[[currentOption commonMetadata]
-                        valueForKey:@"value"]
-                       objectAtIndex:0];
+    NSString *title = @"";
+    NSArray *values = [[currentOption commonMetadata] valueForKey:@"value"];
+    if (values.count > 0) {
+      title = [values objectAtIndex:0];
+    }
+    NSString *language = [currentOption extendedLanguageTag] ? [currentOption extendedLanguageTag] : @"";
     NSDictionary *textTrack = @{
                                 @"index": [NSNumber numberWithInt:i],
                                 @"title": title,
-                                @"language": [currentOption extendedLanguageTag]
+                                @"language": language
                                 };
     [textTracks addObject:textTrack];
   }