Crash when OpenFile dialog is closed clicking cancel button

I, firts sorry mi english.
When i use the OpenFile dialog if i close it or press Cancel the program is crass. This us the error messages:

/home/sonlink/proyectos/vid4web/index.js:31
const filename = libui.UiDialogs.openFile(window);
^
Error: basic_string::_M_construct null not valid
at add_btn.onClicked (/home/sonlink/proyectos/vid4web/index.js:31:36)

If i select a file and press Accept works correctly.
I use the last release installed with npm

What OS and version are you using?
What Node.js version?
Are you able to reproduce the problem using one of the example? (node-pad has an open menu that open a file dialog)

OS: Arch Linux
NodeJS: 10.2.1
And, yes, crash in examples/node-pad.js in Open, Save and Save AS

Ok I'll try to reproduce it.

related to mimecorg/vuido#21

Yes, it's a libui-node bug.

TL;DR: uiOpenFile returns NULL when aborting and we're then freeing the NULL.

Code from libui/test/page5:

static void openFile(uiButton *b, void *data)
{
	char *fn;

	fn = uiOpenFile(parent);
	if (fn == NULL)
		uiLabelSetText(uiLabel(data), "(cancelled)");
	else {
		uiLabelSetText(uiLabel(data), fn);
		uiFreeText(fn);
	}
}

libui-node:

libui-node/src/UiWindow.cc

Lines 166 to 171 in 154e660

    
           static std::string openFile(UiWindow *parent) { 
        
           	char *char_ptr = uiOpenFile(parent->getHandle()); 
        
           	std::string s(char_ptr); 
        
           	uiFreeText(char_ptr); 
        
           	return s; 
        
           }

Fixed in version 0.2.1

	static std::string openFile(UiWindow *parent) {
	char *char_ptr = uiOpenFile(parent->getHandle());
	std::string s(char_ptr);
	uiFreeText(char_ptr);
	return s;
	}