CSVLint crashes Notepad++ with a CSV file open and running editor.getProperty('qwerty') in PythonScript console

[shriprem]

Using

Notepad++ version 8.4.1 with only these two plugins installed:

1. CSVLint version 0.4.5.1
2. PythonScript version 2.0.0.0

Steps to Replicate

1. Open a CSV file in Notepad++ 8.4.1. The CSV file is colorized as expected by the CSVLint plugin.
2. Open PythonScript console.
3. Enter a command in console to set a property value. Example: editor.setProperty('TESTING', 'Hello, World!')
4. Now, enter a command in the console to query that property value. Example: editor.getProperty('TESTING')
5. Notepad++ will crash with no messages. The screenshot below was taken just prior to pressing ENTER with the editor.getProperty('TESTING') command.

Additional Info

This issue does not occur when tested with Notepad++ version 8.3.3, CSVLint v0.4.5, PythonScript v2.0.0.0.

The screenshot when similar steps work fine with the prior version of CSVLint and Notepad++.

You will notice that with Notepad++ version 8.3.3 & CSVLint v0.4.5, I also have the Fixed Width Data Visualizer plugin side panel open. In fact, I am the author of the FWDataViz plugin.

Recently, it came to my notice that in Notepad++ v8.4.1, with the FWDataViz side panel open, if I opened a CSV file, NPP would crash. I did some debugging with my plugin's source code and determined that the cause for the crash was at the point when my plugin issued a SCI_GETPROPERTY SendMessage to Scintilla. To confirm that the plugin at issue is CSVLint, I was able to reproduce the crash without the FWDataViz plugin, and with just the PythonScript plugin by issuing the editor.getProperty('TESTING') command while a CSV file was open in the editor.

Also, this crash does not occur when a different file type than a CSV file is the active document in the NPP editor when I issue the editor.getProperty('TESTING') command. In the screenshot below note that a CSV file is actually open in the first tab.