Public bug reported:

After an upgrade to bionic from xenial whenever I close a tab in Meld I
get the following error:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/meld/diffgrid.py", line 53, in do_unmap
    self._handle1.set_visible(False)
  File "/usr/lib/python3/dist-packages/meld/diffgrid.py", line 289, in 
set_visible
    self._window.hide()
AttributeError: 'NoneType' object has no attribute 'hide'
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/meld/diffgrid.py", line 38, in 
do_unrealize
    self._handle1.unrealize()
  File "/usr/lib/python3/dist-packages/meld/diffgrid.py", line 283, in unrealize
    self._widget.unregister_window(self._window)
AttributeError: 'NoneType' object has no attribute 'unregister_window'
**
Gtk:ERROR:../../../../gtk/gtkwidget.c:5531:gtk_widget_unrealize: assertion 
failed: (!widget->priv->mapped)
Aborted (core dumped)

Meld package version: 3.18.0-6

** Affects: meld (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1769869

Title:
  Crash when trying to close a tab on Ubuntu bionic

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