attempt to insert nil object from objects[2]' was thrown while invoking getConnectedPeripherals on target BleManager with params

I found existing closed issue 134 that says this has been fixed since 3.2.1…

Version

• “react-native-ble-manager”: “^6.2.9”,
• “react-native”: “0.52.1”,
• iOS/Android I’m testing on both but only seen this error on iOS iPhone6

Expected behaviour

promise to be resolved or rejected without exception

Actual behaviour

This doesn’t always happen. I’ve only seen it after a crash and when I’ve restarted the app.

Steps to reproduce

my code:

connect(peripheral) {
    this.log.info('BLE Connect requested', peripheral.id);
    return BleManager.getConnectedPeripherals([])
      .then((peripheralsArray) => {
        // Success code
        let idx = _.findIndex(peripheralsArray,{id:peripheral.id});
        this.log.info('BLE Connected peripherals: ',peripheralsArray,idx);
        if (idx >= 0){
          this.log.info('BLE WE ARE CONNECTED TO DEVICE ALREADY; DISCONNECTING', peripheral.id);
          return  BleManager.disconnect(peripheral.id);
        }
      })
      .then(() => BleManager.connect(peripheral.id))
      .then(()=> BleManager.getConnectedPeripherals([]))
      .then((devices) => {
        this.log.info('BLE Connected to', devices);
      })
      .then(() => BleManager.retrieveServices(peripheral.id))
      .then((peripheralInfo) => {
        this.log.info('BLE Service info:' ,peripheralInfo);
        return Promise.resolve(peripheralInfo);
      });
  }

As you can see in the stack trace I get the first log message but not the second found in the first .then(). I tested the _.findIndex() with possible values and it does not seem to be a problem.

Stack trace and console log

09:11:27.616 debug-service.js:320 BLE Connect requested 90B8E3E4-6917-79AD-390E-A6D99EFFF75B

ExceptionsManager.js:71 Exception '*** -[__NSPlaceholderDictionary initWithObjects:forKeys:count:]: attempt to insert nil object from objects[2]' was thrown while invoking getConnectedPeripherals on target BleManager with params (
        (
    ),
    5143
)
callstack: (
	0   CoreFoundation                      0x00000001826e6da4 <redacted> + 252
	1   libobjc.A.dylib                     0x00000001818a05ec objc_exception_throw + 56
	2   CoreFoundation                      0x000000018267f750 _CFArgv + 0
	3   CoreFoundation                      0x00000001825b80cc <redacted> + 352
	4   CoreFoundation                      0x00000001825b7f48 <redacted> + 64
	5   aura-test                           0x0000000100538f58 dataToArrayBuffer + 268
	6   aura-test                           0x0000000100539464 -[CBPeripheral(com_megster_ble_extension) serviceAndCharacteristicInfo:] + 1180
	7   aura-test                           0x0000000100538394 -[CBPeripheral(com_megster_ble_extension) asDictionary] + 936
	8   aura-test                           0x000000010053c590 -[BleManager getConnectedPeripherals:callback:] + 908
	9   CoreFoundation                      0x00000001826ee580 <redacted> + 144
	10  CoreFoundation                      0x00000001825cd748 <redacted> + 284
	11  CoreFoundation                      0x00000001825d256c <redacted> + 60
	12  aura-test                           0x00000001003427f4 -[RCTModuleMethod invokeWithBridge:module:arguments:] + 2064
	13  aura-test                           0x00000001003ed1ec _ZN8facebook5reactL11invokeInnerEP9RCTBridgeP13RCTModuleDatajRKN5folly7dynamicE + 664
	14  aura-test                           0x00000001003ecd70 _ZZN8facebook5react15RCTNativeModule6invokeEjON5folly7dynamicEiENK3$_0clEv + 132
	15  aura-test                           0x00000001003ecce0 ___ZN8facebook5react15RCTNativeModule6invokeEjON5folly7dynamicEi_block_invoke + 28
	16  libdispatch.dylib                   0x0000000100e451dc _dispatch_call_block_and_release + 24
	17  libdispatch.dylib                   0x0000000100e4519c _dispatch_client_callout + 16
	18  libdispatch.dylib                   0x0000000100e53dfc _dispatch_queue_serial_drain + 768
	19  libdispatch.dylib                   0x0000000100e486ac _dispatch_queue_invoke + 328
	20  libdispatch.dylib                   0x0000000100e54d54 _dispatch_root_queue_drain_deferred_wlh + 352
	21  libdispatch.dylib                   0x0000000100e5be38 _dispatch_workloop_worker_thread + 676
	22  libsystem_pthread.dylib             0x000000018230be70 _pthread_wqthread + 860
	23  libsystem_pthread.dylib             0x000000018230bb08 start_wqthread + 4
)
reactConsoleErrorHandler @ ExceptionsManager.js:73
console.error @ YellowBox.js:71
logToConsole @ RCTLog.js:48
logIfNoNativeHook @ RCTLog.js:31
__callFunction @ MessageQueue.js:353
(anonymous) @ MessageQueue.js:118
__guardSafe @ MessageQueue.js:316
callFunctionReturnFlushedQueue @ MessageQueue.js:117
t @ RNDebuggerWorker.js:1

[folofse]

I had almost the same problem, but it seems to be because of BleManager.retrieveServices, when I loged the recieved value from [charachteristic value] I got an empty NSData, so dataToArrayBuffer crashed and created the problem I had. I managed to fix it by adding this to line 198 in CBPeripheral+Extensions.m

if ([characteristic value] && [[characteristic value] length] > 0) {
          [characteristicDictionary setObject:dataToArrayBuffer([characteristic value]) forKey:@"value"];
      }

Maybe you have a similar problem and this can help you out.

[anwarhamr]

I’ve not seen this since adding @folofse solution above. I think it is even in the codebase now.