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[Beta3] NPE BleManager$BleManagerGattCallback.nextRequest(boolean)' on a null object reference

See original GitHub issue

On Beta3, it happened after I tried to connect and received a TimeoutException

Process: com.mycompany, PID: 20828
    java.lang.NullPointerException: Attempt to invoke direct method 'void no.nordicsemi.android.ble.BleManager$BleManagerGattCallback.nextRequest(boolean)' on a null object reference
        at no.nordicsemi.android.ble.BleManager$BleManagerGattCallback.access$1300(BleManager.java:1836)
        at no.nordicsemi.android.ble.BleManager.lambda$enqueue$4(BleManager.java:1804)
        at no.nordicsemi.android.ble.-$$Lambda$BleManager$KDSxdgn5nClZRFe_FvyLUfX8mWc.run(Unknown Source:2)
        at android.os.Handler.handleCallback(Handler.java:790)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:164)
        at android.app.ActivityThread.main(ActivityThread.java:6494)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)

Might it be that I immediately tried to connect again, even before receiving bluetoothgatt close callback?

//Exception stack trace
2018-10-01 14:51:21.872  D/MyClass: Invoking connect 
2018-10-01 14:51:21.873  D/BluetoothGatt: close()
2018-10-01 14:51:21.873  D/BluetoothGatt: unregisterApp() - mClientIf=7
2018-10-01 14:51:21.881  D/MyClass: onError: a BLE error has occurred message = Error on connection state change, code = 133