diff -ur qtbase-opensource-src-5.9.6-orig/src/platformsupport/linuxaccessibility/dbusconnection.cpp qtbase-opensource-src-5.9.6/src/platformsupport/linuxaccessibility/dbusconnection.cpp
--- qtbase-opensource-src-5.9.6-orig/src/platformsupport/linuxaccessibility/dbusconnection.cpp	2018-06-19 12:42:00.533895696 -0700
+++ qtbase-opensource-src-5.9.6/src/platformsupport/linuxaccessibility/dbusconnection.cpp	2018-06-19 12:45:03.308744607 -0700
@@ -75,7 +75,7 @@
     connect(dbusWatcher, SIGNAL(serviceRegistered(QString)), this, SLOT(serviceRegistered()));
 
     // If it is registered already, setup a11y right away
-    if (c.interface()->isServiceRegistered(A11Y_SERVICE))
+    if (c.interface() && c.interface()->isServiceRegistered(A11Y_SERVICE))
         serviceRegistered();
 
     // In addition try if there is an xatom exposing the bus address, this allows applications run as root to work