This bug was fixed in the package gnome-calculator -
1:3.18.3-0ubuntu1.16.04.1

---------------
gnome-calculator (1:3.18.3-0ubuntu1.16.04.1) xenial; urgency=medium

  * debian/patches/lp1622379-prevent-segfault.patch. (LP: #1622379)
    - Prevents segfault when elements of division to zero have null
      assigned tokens.

 -- Martin Wimpress <martin.wimpr...@ubuntu.com>  Fri, 30 Sep 2016
15:10:10 +0100

** Changed in: gnome-calculator (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1622379

Title:
  SRU: sin(0)/sin(0) crash the the calculator

Status in GNOME Calculator:
  Fix Released
Status in gnome-calculator package in Ubuntu:
  Fix Released
Status in gnome-calculator source package in Xenial:
  Fix Released

Bug description:
  [Impact]

  It is possible to cause gnome-calcualtor segfault when elements of
  division to zero have null assigned tokens. For example, the following
  calculation will trigger a segfault:

  sin(0)/sin(0)

  [Test Case]

  Open a terminal with CTRL+ALT+t and launch 'gnome-calculator'. Type
  the following into the equation entry area 'sin(0)/sin(0)' and press
  enter, gnome-calculator will segfault.

  When the patched 'gnome-calculator' package is installed performing
  the same calculation described above will not cause 'gnome-calculator'
  to crash and instead the following will be displayed: Division by zero
  is undefined

  A debdiff for Xenial is attached in comment #2:

    * https://bugs.launchpad.net/ubuntu/+source/gnome-
  calculator/+bug/1622379/comments/2

  [Regression Potential]

  None expected. The applied patch is taken directly from the following
  upstream commit:

    * https://git.gnome.org/browse/gnome-
  calculator/commit/?id=647eb687821fd74764a55767bf1e34f68f5df940

  gnome-calculator packages have been built in a PPA and tested.

  [Other Info]

  dw3@linux:~$ gnome-calculator

  (gnome-calculator:29011): GLib-CRITICAL **: g_str_has_prefix:
  assertion 'str != NULL' failed

  (gnome-calculator:29011): GLib-CRITICAL **: g_str_has_prefix: assertion 'str 
!= NULL' failed
  Segmentation fault (core dumped)
  dw3@linux:~$

  sin(0)/sin(0) = NaN, but it crash the calculator

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