I have recently release a new version of a software using Qt 5.9.2 and some users report the following crash. I couldn't find recent bug reports about this topic so maybe this is a new one?

Date/Time: 2017-12-11 21:24:00.456 +1100
OS Version: Mac OS X 10.9.5 (13F1911)
Report Version: 11
Anonymous UUID: 9A6B1985-CA3F-7CFC-35DC-4DA3D0D29E88

Crashed Thread: 0 Dispatch queue: com.apple.main-thread

Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: EXC_I386_GPFLT

Application Specific Information:
objc_msgSend() selector name: retain

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 libobjc.A.dylib 0x00007fff8d907097 objc_msgSend + 23
1 com.apple.CoreText 0x00007fff866c106c CreateFontWithFontURL(__CFURL const*, bool) + 412
2 com.apple.CoreText 0x00007fff866c0d2b TCGFontCache::CopyFont(__CFURL const*, bool) const + 91
3 com.apple.CoreText 0x00007fff866c0b55 TBaseFont::CopyNativeFont() const + 69
4 com.apple.CoreText 0x00007fff866c0ad6 TBaseFont::CopyGraphicsFont() const + 26
5 com.apple.CoreText 0x00007fff866c07ec TBaseFont::CopyTable(unsigned int) const + 188
6 com.apple.CoreText 0x00007fff866d281c TBaseFont::CreateTraitsValuesPerFontInfo() const + 1140
7 com.apple.CoreText 0x00007fff866d22af TBaseFont::CopyTraitsInternal() const + 87
8 com.apple.CoreText 0x00007fff866d1e3d TBaseFont::CopyAttribute(unsigned long) const + 493
9 com.apple.CoreText 0x00007fff866bfeb1 TDescriptor::CopyAttribute(__CFString const*) const + 175
10 com.apple.CoreText 0x00007fff866bfddf CTFontDescriptorCopyAttribute + 99
11 libqcocoa.dylib 0x0000000106dbdbeb 0x106d4a000 + 474091
12 libqcocoa.dylib 0x0000000106dbd298 0x106d4a000 + 471704
13 libqcocoa.dylib 0x0000000106dc046f 0x106d4a000 + 484463
14 org.qt-project.QtGui 0x00000001047b1baf 0x1046c6000 + 965551
15 org.qt-project.QtGui 0x00000001047b19b2 0x1046c6000 + 965042
16 org.qt-project.QtGui 0x00000001047b1e53 QFontDatabase::addApplicationFont(QString const&) + 227
17 org.qt-project.QtQuick 0x000000010391cdc9 0x1038d3000 + 302537
18 org.qt-project.QtQml 0x0000000103eb348a 0x103c73000 + 2360458
19 org.qt-project.QtQml 0x0000000103eb453e 0x103c73000 + 2364734
20 org.qt-project.QtQml 0x0000000103eb122f 0x103c73000 + 2351663
21 org.qt-project.QtQml 0x0000000103eb5a4d 0x103c73000 + 2370125
22 org.qt-project.QtQml 0x0000000103eb072f 0x103c73000 + 2348847
23 org.qt-project.QtQml 0x0000000103eb3f79 0x103c73000 + 2363257
24 org.qt-project.QtQml 0x0000000103eb122f 0x103c73000 + 2351663
25 org.qt-project.QtQml 0x0000000103eb5a4d 0x103c73000 + 2370125
26 org.qt-project.QtQml 0x0000000103eb072f 0x103c73000 + 2348847
27 org.qt-project.QtQml 0x0000000103eaf685 0x103c73000 + 2344581
28 org.qt-project.QtQml 0x0000000103e2bd19 QQmlComponentPrivate::beginCreate(QQmlContextData*) + 889
29 org.qt-project.QtQml 0x0000000103e2b941 QQmlComponent::create(QQmlContext*) + 97
30 org.qt-project.QtQuick 0x0000000103a84ecb QQuickView::continueExecute() + 619
31 org.qt-project.QtQuick 0x0000000103a84c42 QQuickViewPrivate::execute() + 626
32 com.imaginando.ubridge 0x0000000102b47220 main + 528
33 libdyld.dylib 0x00007fff8ba6a5fd start + 1