Unfortunately, I can't make much with a backtrace in this format.

Would you be so kind as to run NetworkManager in a debugger and provide
me with the output for a full backtrace again?

This is how this can be achieved:

sudo apt-get install network-manager-dbg libglib2.0-0-dbg gdb
sudo stop network-manager
gdb --args /usr/sbin/NetworkManager --no-daemon --log-level=debug

(and now inside gdb)
run
(and once you've reproduced the issue and NM crashed)
bt full


If you can't actually get a backtrace with "bt full"; the full output of the 
session would actually be useful.

While there shouldn't be any sensitive details such as passwords or
usernames in the output; please be mindful to check if other details
such as your IP address or the name of WiFi networks you would rather
not share aren't included. If you're unsure, feel free to email me the
logs directly rather than attaching to the bug report.

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Title:
  *** Error in `nm-applet': free(): invalid pointer: 0x00000000015edba0
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