QSsl connection problem in OS X Sierra 10.12.2

Hi all
i ported my osx app from QT5.3.2 (XCode 7.3.2) to Qt5.71 usinc XCode 8.2.1.
Now, i can't create any ssl connection using QNetworkRequest. It seems a problem parsing Certificates

2017-01-16 20:11:36.591004 app[69207:195868] [General] *** -[__NSArrayM insertObject:atIndex:]: object cannot be nil
2017-01-16 20:11:36.591325 app[69207:195868] [General] (
0 CoreFoundation 0x00007fffc6cd4e7b __exceptionPreprocess + 171
1 libobjc.A.dylib 0x00007fffdb8bfcad objc_exception_throw + 48
2 CoreFoundation 0x00007fffc6bed622 -[__NSArrayM insertObject:atIndex:] + 1442
3 QtNetwork 0x000000010213c9c7 _ZNK15QSslCertificate6toTextEv + 56167
4 QtNetwork 0x0000000102138d00 _ZNK15QSslCertificate6toTextEv + 40608
5 QtNetwork 0x0000000102138e47 _ZNK15QSslCertificate6toTextEv + 40935
6 QtCore 0x0000000101556651 _ZN11QMetaObject8activateEP7QObjectiiPPv + 913
7 QtNetwork 0x000000010210902e _ZNK15QAbstractSocket10socketTypeEv + 318
8 QtNetwork 0x0000000102115c8a _ZN12QLocalServer11qt_metacallEN11QMetaObject4CallEiPPv + 12202
9 QtWidgets 0x00000001007aca4d _ZN19QApplicationPrivate13notify_helperEP7QObjectP6QEvent + 269
10 QtWidgets 0x00000001007af392 _ZN12QApplication6notifyEP7QObjectP6QEvent + 5906
11 QtCore 0x00000001015255c4 _ZN16QCoreApplication15notifyInternal2EP7QObjectP6QEvent + 164
12 QtCore 0x0000000101577b3a _ZN27QEventDispatcherUNIXPrivate23activateSocketNotifiersEv + 250
13 QtCore 0x000000010157861e _ZN20QEventDispatcherUNIX13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE + 1262
14 QtCore 0x00000001015219d1 _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE + 401
15 QtCore 0x0000000101364f7e _ZN7QThread4execEv + 110
16 QtCore 0x000000010136890a _ZN18QThreadStorageData6finishEPPv + 2458
17 libsystem_pthread.dylib 0x00007fffdc3baaab _pthread_body + 180
18 libsystem_pthread.dylib 0x00007fffdc3ba9f7 _pthread_body + 0
19 libsystem_pthread.dylib 0x00007fffdc3ba1fd thread_start + 13

any help would be really apreciated