ios: fix "Error when sending event: downloadBegin"

ios/RNBackgroundDownloader.m

@@ -353,11 +353,13 @@ RCT_EXPORT_METHOD(completeHandler:(nonnull NSString *)jobId
         if (taskCofig != nil) {
             if (!taskCofig.reportedBegin) {
                 NSDictionary *responseHeaders = ((NSHTTPURLResponse *)downloadTask.response).allHeaderFields;
-                [self sendEventWithName:@"downloadBegin" body:@{
-                  @"id": taskCofig.id,
-                  @"expectedBytes": [NSNumber numberWithLongLong: totalBytesExpectedToWrite],
-                  @"headers": responseHeaders
-                }];
+                if (self.bridge) {
+                    [self sendEventWithName:@"downloadBegin" body:@{
+                        @"id": taskCofig.id,
+                        @"expectedBytes": [NSNumber numberWithLongLong: totalBytesExpectedToWrite],
+                        @"headers": responseHeaders
+                    }];
+                }
                 taskCofig.reportedBegin = YES;
             }
 

package.json

@@ -1,6 +1,6 @@
 {
   "name": "react-native-background-downloader",
-  "version": "2.4.1",
+  "version": "2.4.2",
   "description": "A library for React-Native to help you download large files on iOS and Android both in the foreground and most importantly in the background.",
   "main": "index.js",
   "scripts": {