Backtrace says

#0  data (this=0x4) at 
../../include/QtCore/../../src/corelib/tools/qscopedpointer.h:135
#1  qGetPtrHelper<QScopedPointer<QObjectData> > (p=...) at 
../../include/QtCore/../../src/corelib/global/qglobal.h:961
#2  d_func (this=0x0) at 
../../include/QtCore/../../src/corelib/kernel/qobject.h:110
#3  QCoreApplication::notifyInternal (this=0xa16f00, receiver=0x0, 
event=event@entry=0xbed03b90) at #4  0xa8bf76dc in sendEvent (event=0xbed03b90, 
receiver=<optimized out>) at 
/usr/include/arm-linux-gnueabihf/qt5/QtCore/qcoreapplication.h:228
#5  TouchRegistry::TouchInfo::notifyCandidatesOfOwnershipResolution 
(this=this@entry=0x108ad60) at 
/build/buildd/unity8-8.02+15.04.20150603.1/libs/UbuntuGestures/TouchRegistry.cpp:500

Seems that candidates[i].item in
          QCoreApplication::sendEvent(candidates[i].item, &lostOwnershipEvent);
is a null pointer

** Changed in: unity8 (Ubuntu)
     Assignee: (unassigned) => Daniel d'Andrada (dandrader)

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https://bugs.launchpad.net/bugs/1473492

Title:
  
/usr/bin/unity8:11:data:qGetPtrHelper:d_func:QCoreApplication::notifyInternal:sendEvent

Status in unity8 package in Ubuntu:
  New

Bug description:
  The Ubuntu Error Tracker has been receiving reports about a problem
  regarding unity8.  This problem was most recently seen with version
  8.02+15.10.20150603.1-0ubuntu1, the problem page at
  https://errors.ubuntu.com/problem/80fe9ee0261ee41ee123fa00a4830fc21d075d87
  contains more details.

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