java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference

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java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference
at com.ihealth.communication.manager.iHealthDevicesManager.b(Unknown Source)
at com.ihealth.communication.manager.a.onConnectionStateChange(Unknown Source)
at com.ihealth.communication.manager.e.onConnectionStateChange(Unknown Source)
at com.ihealth.communication.base.ble.AndroidBle.onConnectionStateChange(Unknown Source)
at com.ihealth.ble.Ble.commandCheckReconnectDevice(Ble.java:321)
at com.ihealth.ble.Ble.access$8(Ble.java:283)
at com.ihealth.ble.Ble$2.onConnectionStateChange(Ble.java:115)
at android.bluetooth.BluetoothGatt$1.onClientConnectionState(BluetoothGatt.java:181)
at android.bluetooth.IBluetoothGattCallback$Stub.onTransact(IBluetoothGattCallback.java:70)
at android.os.Binder.execTransact(Binder.java:446)

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