diff --git a/React/Base/RCTMultipartDataTask.m b/React/Base/RCTMultipartDataTask.m
index 0fb1623db..27feaffbb 100644
--- a/React/Base/RCTMultipartDataTask.m
+++ b/React/Base/RCTMultipartDataTask.m
@@ -55,6 +55,7 @@ static BOOL isStreamTaskSupported() {
   }
   NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:request];
   [dataTask resume];
+  [session finishTasksAndInvalidate];
 }
 
 - (void)URLSession:(__unused NSURLSession *)session
@@ -91,7 +92,9 @@ didReceiveResponse:(NSURLResponse *)response
 
 - (void)URLSession:(__unused NSURLSession *)session task:(__unused NSURLSessionTask *)task didCompleteWithError:(NSError *)error
 {
-  _partHandler(_statusCode, _headers, _data, error, YES);
+  if (_partHandler) {
+    _partHandler(_statusCode, _headers, _data, error, YES);
+  }
 }
 
 - (void)URLSession:(__unused NSURLSession *)session dataTask:(__unused NSURLSessionDataTask *)dataTask didReceiveData:(NSData *)data
@@ -111,6 +114,7 @@ didBecomeInputStream:(NSInputStream *)inputStream
 {
   RCTMultipartStreamReader *reader = [[RCTMultipartStreamReader alloc] initWithInputStream:inputStream boundary:_boundary];
   RCTMultipartDataTaskCallback partHandler = _partHandler;
+  _partHandler = nil;
   NSInteger statusCode = _statusCode;
 
   BOOL completed = [reader readAllParts:^(NSDictionary *headers, NSData *content, BOOL done) {