diff --git a/API.md b/API.md
index bf748016..625efeb5 100644
--- a/API.md
+++ b/API.md
@@ -316,12 +316,14 @@ var styles = StyleSheet.create({
 
 
 ### Event props
+
 | Name                                                                                            | Platforms Support         | 
 |-------------------------------------------------------------------------------------------------|---------------------------|
 | [onAudioBecomingNoisy](#onaudiobecomingnoisy)                                                   | Android, iOS              |
 | [onBandwidthUpdate](#onbandwidthupdate)                                                         | Android                   |
 | [onBuffer](#onbuffer)                                                                           | Android, iOS              |
 | [onEnd](#onend)                                                                                 | All                       |
+| [onError](#onerror)                                                                             | Android, iOS              |
 | [onExternalPlaybackChange](#onexternalplaybackchange)                                           | iOS                       |
 | [onFullscreenPlayerWillPresent](#onfullscreenplayerwillpresent)                                 | Android, iOS              |
 | [onFullscreenPlayerDidPresent](#onfullscreenplayerdidpresent)                                   | Android, iOS              |
@@ -338,7 +340,6 @@ var styles = StyleSheet.create({
 | [onSeek](#onseek)                                                                               | Android, iOS, Windows UWP |
 | [onTimedMetadata](#ontimedmetadata)                                                             | Android, iOS              |
 
-
 ### Methods
 | Name |Plateforms Support  | 
 |--|--|
@@ -1026,6 +1027,17 @@ Payload: none
 
 Platforms: all
 
+#### onError
+Callback function that is called when the player experiences a playback error.
+
+Payload:
+
+Property | Type | Description
+--- | --- | ---
+error | object | Object containing properties with information about the error
+
+Platforms: all
+
 #### onExternalPlaybackChange
 Callback function that is called when external playback mode for current playing video has changed. Mostly useful when connecting/disconnecting to Apple TV – it's called on connection/disconnection.
 
@@ -1689,3 +1701,4 @@ allprojects {
 }
 ```
 If you encounter an error `Could not find com.android.support:support-annotations:27.0.0.` reinstall your Android Support Repository.
+
diff --git a/ios/Video/RCTVideo.swift b/ios/Video/RCTVideo.swift
index 12b1b25d..8e25e158 100644
--- a/ios/Video/RCTVideo.swift
+++ b/ios/Video/RCTVideo.swift
@@ -685,7 +685,7 @@ class RCTVideo: UIView, RCTVideoPlayerViewControllerDelegate, RCTPlayerObserverH
 
         if _controls {
             let viewController:UIViewController! = self.reactViewController()
-            viewController.addChild(_playerViewController)
+            viewController?.addChild(_playerViewController)
             self.addSubview(_playerViewController.view)
         }
 
diff --git a/package.json b/package.json
index 7ce95b15..bde0ebf5 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
     "name": "react-native-video",
-    "version": "6.0.0-alpha.3",
+    "version": "6.0.0-alpha.4",
     "description": "A <Video /> element for react-native",
     "main": "Video.js",
     "license": "MIT",
@@ -34,6 +34,7 @@
         "DRMType.js",
         "TextTrackType.js",
         "VideoResizeMode.js",
-        "react-native-video.podspec"
+        "react-native-video.podspec",
+        "docs"
     ]
 }