Wikitude

IOS app crashes when starting AR

This is the error log:

F1020 14:23:49.317847 2670616576 utilities.cc:320> Check failed: !IsGoogleLoggingInitialized() You called InitGoogleLogging() twice!

*** Check failure stack trace: ***

    @        0x1002444b8  google::LogMessage::Flush()

    @        0x1002452d8  google::LogMessageFatal::~LogMessageFatal()

    @        0x100244804  google::LogMessageFatal::~LogMessageFatal()

    @        0x100248954  google::glog_internal_namespace_::InitGoogleLoggingUtilities()

    @        0x100377714  wikitude::common_library::impl::iOSConsoleWriter::iOSConsoleWriter()

    @        0x10019eca8  -

    @        0x10019c0b4  -

    @        0x10019bfac  -

    @        0x100149a38  -

    @        0x188993610  <redacted>

    @        0x1889ab6ec  <redacted>

    @        0x188b3fd68  <redacted>

    @        0x188a4f430  <redacted>

    @        0x188a4f10c  <redacted>

    @        0x188a4f074  <redacted>

    @        0x18898eff0  <redacted>

    @        0x188195f14  <redacted>

    @        0x188190b20  <redacted>

    @        0x1881909e0  <redacted>

    @        0x18819007c  <redacted>

    @        0x18818fdd0  <redacted>

    @        0x1881894bc  <redacted>

    @        0x1833f3c30  <redacted>

    @        0x1833f19d4  <redacted>

    @        0x1833f1e04  <redacted>

    @        0x183320dc0  CFRunLoopRunSpecific

    @        0x18e474088  GSEventRunModal

    @        0x1889faf44  UIApplicationMain

    @        0x100142000  main

    @        0x19885e8b8  <redacted>

I've implemented the Wikitude SDK in my app in order to display my Wikitude Studio content inside my app. Everything works fine except for a thing, if I start the AR class then I go back to the home screen and finally I restart the AR the app crashes.
The crash occurs when calling:     self.architectView = ;

Does anyone know why does it happen and how to fix it?

Thanks