Created attachment 373228 [details]
Backtrace from most recent core dump of quote deletion.

I'm somewhat new to doing bug reporting for Gnucash.
How do I gather the information needed to diagnose this problem.

Repeat by:

Open Price Database (Note that the currently published documentation calls it the "Price Editor", presumably using the 2.6 codeline names instead of the 3.x codeline.)

Select a Market, for example NASADAQ.
Select a stock, for example AAPL
Select a quote, for example the one of 10 July 2017.
Click Remove
When the confirmation pop-up arrives, click "Delete" to confirm.

Expected behavior: 
The quote line gets deleted.

Actual behavior:

SOME TIME AFTER the change has been made, indeed I can do a couple deletions,
seemingly with success, Gnucash crashes.

Sometimes the display of the list of quotes does not change, as of the deletion
silently failed.

I've attached a backtrace from one of the crashes.  Perhaps it has already been received through another channel.