Error while switching layouts

[shomenbanerjee]

Description

What steps will reproduce the problem?

What is the expected output? What do you see instead?

Please provide any additional information below

File "C:\ProgramData\Anaconda3\lib\site-packages\spyder\app\mainwindow.py", line 2132, in closeEvent
if self.closing(True):
File "C:\ProgramData\Anaconda3\lib\site-packages\spyder\app\mainwindow.py", line 2186, in closing
self.save_current_window_settings(prefix)
File "C:\ProgramData\Anaconda3\lib\site-packages\spyder\app\mainwindow.py", line 1415, in save_current_window_settings
self.maximize_dockwidget(restore=True)# Restore non-maximized layout
File "C:\ProgramData\Anaconda3\lib\site-packages\spyder\app\mainwindow.py", line 2268, in maximize_dockwidget
self.last_plugin.dockwidget.setWidget(self.last_plugin)
AttributeError: 'NoneType' object has no attribute 'dockwidget'
Error in atexit._run_exitfuncs:

Version and main components

• Spyder Version: 3.2.4
• Python Version: 3.6.3
• Qt Versions: 5.6.2, PyQt5 5.6 on Windows

Dependencies

pyflakes >=0.6.0 :  1.6.0 (OK)
pycodestyle >=2.3:  2.3.1 (OK)
pygments >=2.0   :  2.2.0 (OK)
pandas >=0.13.1  :  0.20.3 (OK)
numpy >=1.7      :  1.12.1 (OK)
sphinx >=0.6.6   :  1.6.3 (OK)
rope >=0.9.4     :  0.10.5 (OK)
jedi >=0.9.0     :  0.10.2 (OK)
nbconvert >=4

[ccordoba12]

Thanks for reporting.

@dalthviz, I think you solved a bug similar to this one before. Do you remember why it happens?

[dalthviz]

I'm not quite sure about this but probably we should add a validation here with something like ... or self.last_plugin is None:?

[ccordoba12]

Closing as a duplicate of issue #5477.