While uploading a blob using Fetch app crashes on iOS

[bhavukjain1]

I'm trying to upload my file to a pre-signed URL using fetch:

let url = `data:image/png;base64,${response.data}`
fetch(url)
   .then(res => res.blob())
   .then(blob => {
      fetch(s3URL, {method:'PUT', body:blob})
   })

I get this error:

Exception '*** -[__NSPlaceholderDictionary initWithObjects:forKeys:count:]: attempt to insert nil object from objects[0]' was thrown while invoking sendRequest on target Networking with params (
        {
        data =         {
            blob =             {
                blobId = "e292f653-6729-498c-9020-8ea47a0f277f";
                lastModified = 1535473043365;
                offset = 0;
                size = 690263;
                type = "";
            };
            trackingName = unknown;
        };
        headers =         {
        };
        incrementalUpdates = 0;
        method = PUT;
        responseType = text;
        timeout = 0;
        url = "https://example.com";
        withCredentials = 0;
    },
    387
)
callstack: (
	0   CoreFoundation                      0x0000000183dceda4 <redacted> + 252
	1   libobjc.A.dylib                     0x0000000182f885ec objc_exception_throw + 56
	2   CoreFoundation                      0x0000000183d67750 _CFArgv + 0
	3   CoreFoundation                      0x0000000183ca00cc <redacted> + 352
	4   CoreFoundation                      0x0000000183c9ff48 <redacted> + 64
	5   QuizOn_New                          0x00000001049486ec -[RCTBlobManager handleNetworkingRequest:] + 664
	6   QuizOn_New                          0x0000000104ba1934 -[RCTNetworking processDataForHTTPQuery:callback:] + 1436
	7   QuizOn_New                          0x0000000104ba06e0 -[RCTNetworking buildRequest:completionBlock:] + 3108
	8   QuizOn_New                          0x0000000104ba6d10 -[RCTNetworking sendRequest:responseSender:] + 232
	9   CoreFoundation                      0x0000000183dd6580 <redacted> + 144
	10  CoreFoundation                      0x0000000183cb5748 <redacted> + 284
	11  CoreFoundation                      0x0000000183cba56c <redacted> + 60
	12  QuizOn_New                          0x00000001049def30 -[RCTModuleMethod invokeWithBridge:module:arguments:] + 2064
	13  QuizOn_New                          0x0000000104a89b60 _ZN8facebook5reactL11invokeInnerEP9RCTBridgeP13RCTModuleDatajRKN5folly7dynamicE + 664
	14  QuizOn_New                          0x0000000104a896f0 _ZZN8facebook5react15RCTNativeModule6invokeEjON5folly7dynamicEiENK3$_0clEv + 132
	15  QuizOn_New                          0x0000000104a89660 ___ZN8facebook5react15RCTNativeModule6invokeEjON5folly7dynamicEi_block_invoke + 28
	16  libdispatch.dylib                   0x000000010565d260 _dispatch_call_block_and_release + 24
	17  libdispatch.dylib                   0x000000010565d220 _dispatch_client_callout + 16
	18  libdispatch.dylib                   0x000000010566be80 _dispatch_queue_serial_drain + 768
	19  libdispatch.dylib                   0x0000000105660730 _dispatch_queue_invoke + 328
	20  libdispatch.dylib                   0x000000010566cdd8 _dispatch_root_queue_drain_deferred_wlh + 352
	21  libdispatch.dylib                   0x0000000105673ebc _dispatch_workloop_worker_thread + 676
	22  libsystem_pthread.dylib             0x00000001839f3e70 _pthread_wqthread + 860
	23  libsystem_pthread.dylib             0x00000001839f3b08 start_wqthread + 4
)

RCTFatal
facebook::react::invokeInner(RCTBridge*, RCTModuleData*, unsigned int, folly::dynamic const&)
facebook::react::RCTNativeModule::invoke(unsigned int, folly::dynamic&&, int)::$_0::operator()() const
invocation function for block in facebook::react::RCTNativeModule::invoke(unsigned int, folly::dynamic&&, int)
_dispatch_call_block_and_release
_dispatch_client_callout
_dispatch_queue_serial_drain
_dispatch_queue_invoke
_dispatch_root_queue_drain_deferred_wlh
_dispatch_workloop_worker_thread
_pthread_wqthread
start_wqthread

[react-native-bot]

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