Version 7.8 and 8.0 crashes KeePass when editing templates on Linux

[jfabini]

A reproducible issue that seems to affect Linux only (Linux Mint 19.3 (64 bit), KeePass 2.44, KPEntryTemplates 7.8 and 8.0) that may or may not be related to #64

When opening an existing password database and trying to edit a KPEntryTemplate template on Linux, Keepass crashes deterministically. The KeePass window disappears but its process must be killed in order to be able to restart KeePass.
The following steps are needed:
Start KeePass, enter the KeePass database password.
Select the Template folder, open an existing template (the focus is, as it has ever been, on the "Template" tab, but the displayed tab is "Entry"). Click on the "Entry" tab, then on the "Template" tab again - this crashes the KeePass app, the Window disappears.

When creating a new template from the scratch it works until "Init as a template" is clicked. Then KeePass asks about saving unsaved changes and exits (but, again, hangs and must be killed).

Instantiating entries from existing templates, however, works.

I tried the identical command sequence with an existing and with an newly created database - same reproducible behavior: crash. On Windows 10, 64 bit the same command sequence works as expected.

[ilolipopi]

Same issue on Ubuntu 20.04. If i run mono /path/to/KeePass.exe (with mono-complete installed) in the terminal, I get following things when KeePass crashes.

System.ArgumentOutOfRangeException: Specified argument was out of the range of valid values.
Parameter name: Width is less than MinimumWidth
  at System.Windows.Forms.DataGridViewColumn.set_Width (System.Int32 value) [0x00018] in <a3daa9b84fd241a497578a25f68bc3c7>:0 
  at KPEntryTemplates.EntryTemplateManager.InitializeGridView (System.Windows.Forms.TabPage page) [0x00519] in <3453210a85834eb8a7c8309b0a86ec58>:0 
  at KPEntryTemplates.EntryTemplateManager.data_grid_show () [0x0000b] in <3453210a85834eb8a7c8309b0a86ec58>:0 
  at KPEntryTemplates.EntryTemplateManager.main_tabs_control_Selecting (System.Object sender, System.Windows.Forms.TabControlCancelEventArgs e) [0x00071] in <3453210a85834eb8a7c8309b0a86ec58>:0 
  at System.Windows.Forms.TabControl.OnSelecting (System.Windows.Forms.TabControlCancelEventArgs e) [0x0001c] in <a3daa9b84fd241a497578a25f68bc3c7>:0 
  at System.Windows.Forms.TabControl.set_SelectedIndex (System.Int32 value) [0x000e7] in <a3daa9b84fd241a497578a25f68bc3c7>:0 
  at System.Windows.Forms.TabControl.MouseDownHandler (System.Object sender, System.Windows.Forms.MouseEventArgs e) [0x002e9] in <a3daa9b84fd241a497578a25f68bc3c7>:0 
  at System.Windows.Forms.Control.OnMouseDown (System.Windows.Forms.MouseEventArgs e) [0x0001c] in <a3daa9b84fd241a497578a25f68bc3c7>:0 
  at System.Windows.Forms.Control.WmLButtonDown (System.Windows.Forms.Message& m) [0x00097] in <a3daa9b84fd241a497578a25f68bc3c7>:0 
  at System.Windows.Forms.Control.WndProc (System.Windows.Forms.Message& m) [0x00177] in <a3daa9b84fd241a497578a25f68bc3c7>:0 
  at System.Windows.Forms.TabControl.WndProc (System.Windows.Forms.Message& m) [0x0006e] in <a3daa9b84fd241a497578a25f68bc3c7>:0 
  at System.Windows.Forms.Control+ControlWindowTarget.OnMessage (System.Windows.Forms.Message& m) [0x00000] in <a3daa9b84fd241a497578a25f68bc3c7>:0 
  at System.Windows.Forms.Control+ControlNativeWindow.WndProc (System.Windows.Forms.Message& m) [0x0000b] in <a3daa9b84fd241a497578a25f68bc3c7>:0 
  at System.Windows.Forms.NativeWindow.WndProc (System.IntPtr hWnd, System.Windows.Forms.Msg msg, System.IntPtr wParam, System.IntPtr lParam) [0x0008e] in <a3daa9b84fd241a497578a25f68bc3c7>:0 

[slevit]

Same issue. Ubuntu 20.04, keepass 2.44 and mono-complete 6.8.0. When creating a new template from the scratch it works until "Init as a template" is clicked. Then KeePass asks about saving unsaved changes and crashes.

ADDENDUM: Unable to reproduce the issue on Windows 10 with the same database.
keepass-partial-crash-output.txt

[Sanaki]

In my case, I make a new entry, click entry, then back to template (because it starts on template displaying entry still, issue #10, supposedly should have been fixed) init as template, keepass minimizes itself. Bring it back up if the entry was minimized with it (sometimes it isn't), click entry and template, then init as template a second time. At that point, I get this error twice:

Clicking cancel twice, my template is ready to be set up, no crash.

I can also edit templates, but similar to above, when I first click entry and back to template, keepass minimizes itself, then when I bring it back up, I click entry and template again to be able to modify the template. No error messages in this case.

Mint 19.3, Mono 6.12.0.90, KeePass 2.46, KPEntryTemplates 8.0

[mitchcapper]

If someone can put together a virtualbox or similar VM I can use to replicate this I can try to spin it up and see if I can debug. I don't have any *nix machines with UI.

[Virgus]

If someone can put together a virtualbox or similar VM I can use to replicate this I can try to spin it up and see if I can debug. I don't have any *nix machines with UI.

Dear Mitch, I just came to check about templates errors (I'm on W10) and saw your messages. I'm having errors too, but if I click "continue" button KeePass does not quit. So I've been using templates plugins so far, knowing that every time I opened an entry I would see the error.

I just purged my concerned db from all my entries and changed the master password which is now "test".
Please let me know if there's anything else I could do to help you troubleshoot this issue.

Kind regards,
V.
Test.zip

I forgot to add the details of the error:
Details.txt