Olli, I retraced your crash dump, but it crashes before running any Oxide code:

#0  0x00007f5b56866f79 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
  [Error: ../nptl/sysdeps/unix/sysv/linux/raise.c was not found in source tree]
#1  0x00007f5b5686a388 in __GI_abort () at abort.c:89
  [Error: abort.c was not found in source tree]
#2  0x00007f5b58ee0655 in qt_message_fatal (context=..., message=...) at global/qlogging.cpp:979
  [Error: global/qlogging.cpp was not found in source tree]
#3  QMessageLogger::fatal (this=this@entry=0x7fff1b868ce0, msg=msg@entry=0x7f5b4ff08640 "QUbuntu: Could not create application instance") at global/qlogging.cpp:384
  [Error: global/qlogging.cpp was not found in source tree]
#4  0x00007f5b4fef1d70 in QUbuntuIntegration::QUbuntuIntegration (this=0x7f5b5b70f7f0, input_factory=0x7f5b50113f38 <(anonymous namespace)::InputAdaptorFactory::instance()::global_instance>) at ../../../../../src/platforms/ubuntu/ubuntucommon/integration.cc:75
  [Error: ../../../../../src/platforms/ubuntu/ubuntucommon/integration.cc was not found in source tree]
#5  0x00007f5b4fef3bcc in QUbuntuMirIntegration::QUbuntuMirIntegration (this=0x7f5b5b70f7f0) at ../../../../../../src/platforms/ubuntu/ubuntumir/ubuntumircommon/integration.cc:39
  [Error: ../../../../../../src/platforms/ubuntu/ubuntumir/ubuntumircommon/integration.cc was not found in source tree]
#6  0x00007f5b4feeba0a in QUbuntuMirClientIntegrationPlugin::create (this=<optimised out>, system=..., paramList=...) at ../../../../../../src/platforms/ubuntu/ubuntumir/ubuntumirclient/main.cc:41
  [Error: ../../../../../../src/platforms/ubuntu/ubuntumir/ubuntumirclient/main.cc was not found in source tree]
#7  0x00007f5b57b2c3d1 in loadIntegration (argv=0x7fff1b869208, argc=@0x7fff1b8690ac: 5, parameters=..., key=..., loader=0x7f5b580a5dd0 <_ZZN12_GLOBAL__N_112Q_QGS_loader13innerFunctionEvE6holder>) at kernel/qplatformintegrationfactory.cpp:64
  [Error: kernel/qplatformintegrationfactory.cpp was not found in source tree]
#8  QPlatformIntegrationFactory::create (platform=..., paramList=..., argc=@0x7fff1b8690ac: 5, argv=argv@entry=0x7fff1b869208, platformPluginPath=...) at kernel/qplatformintegrationfactory.cpp:81
  [Error: kernel/qplatformintegrationfactory.cpp was not found in source tree]
#9  0x00007f5b57b3573d in init_platform (argv=0x7fff1b869208, argc=@0x7fff1b8690ac: 5, platformThemeName=..., platformPluginPath=..., pluginArgument=...) at kernel/qguiapplication.cpp:897
  [Error: kernel/qguiapplication.cpp was not found in source tree]
#10 QGuiApplicationPrivate::createPlatformIntegration (this=<optimised out>) at kernel/qguiapplication.cpp:1039
  [Error: kernel/qguiapplication.cpp was not found in source tree]
#11 0x00007f5b57b362ed in QGuiApplicationPrivate::createEventDispatcher (this=<optimised out>) at kernel/qguiapplication.cpp:1054
  [Error: kernel/qguiapplication.cpp was not found in source tree]
#12 0x00007f5b590c70d1 in QCoreApplication::init (this=this@entry=0x7fff1b8690b0) at kernel/qcoreapplication.cpp:711
  [Error: kernel/qcoreapplication.cpp was not found in source tree]
#13 0x00007f5b590c7146 in QCoreApplication::QCoreApplication (this=0x7fff1b8690b0, p=...) at kernel/qcoreapplication.cpp:638
  [Error: kernel/qcoreapplication.cpp was not found in source tree]
#14 0x00007f5b57b37119 in QGuiApplication::QGuiApplication (this=0x7fff1b8690b0, p=...) at kernel/qguiapplication.cpp:492
  [Error: kernel/qguiapplication.cpp was not found in source tree]
#15 0x00007f5b5876eedd in QApplication::QApplication (this=0x7fff1b8690b0, argc=@0x7fff1b8690ac: 5, argv=0x7fff1b869208, _internal=328193) at kernel/qapplication.cpp:541
  [Error: kernel/qapplication.cpp was not found in source tree]
#16 0x00007f5b59731b8f in BrowserApplication::BrowserApplication(int&, char**) ()
#17 0x00007f5b5972d462 in WebappContainer::WebappContainer(int&, char**) ()
#18 0x00007f5b5972c6af in main ()