[Possible bug in the file gfile_fs_fatfs.c ?]

Probably in the file gfile_fs_fatfs.c there is a bug, namely in the functions -
FatfsExists and fatfsFileSize when the LFN option is enabled.
This was tested on the Nucleo F401RE board without the OS.
Sometimes when you call fatfsExists or fatfsFileSize, HARDFAULT appears.
Analysis of the execution of the program code showed that inside the FATFS library
There is a call to the uninitialized pointer fno.lfname.

Therefore, in the functions - fatfsExists and fatfsFileSize it is enough to add this code:

#if _USE_LFN

   Fno.lfname = 0;
   Fno.lfsize = 0;

#endif

If I'm wrong somewhere, then correct me.

Thank you in advance!
 

[long or short click]

Thanks for the advice.
I will do according to the method 2.

[long or short click]

How to trace a short or long press on the button widget?

(use touchscreen).

[Fonts in FLASH]

Thanks for the answer, and it is very sad.
My board has little memory.
I can use a buffer for fonts?
But it is better to use a flash memory (it is addressable, but to access the data required reading function - pgm_read_byte(...) ... pgm_read_block(...) 

Push me in the right direction. (and sorry for my english)

[Fonts in FLASH]

How to use fonts stored on external memory. For example, in ROMFS.

Is it possible at all?