LEN seems linked to issue with array referencing

[circular]

Hi, I'm enjoying SmallBASIC and wanted to share this issue in case it's relevant.

Version: SmallBasic FLTK 12.23, 7 Sep 2021 OS: Linux / AppImage

As an example, running the example here, an error is thrown:

https://smallbasic.github.io/pages/features.html

Code:

tload "/etc/passwd", buffer
for row in buffer
  split row, ":", fields()
  if (len(fields) > 0) then
    local user
    user.name = fields(0)
    user.passwd = fields(1)
    user.userId = fields(2)
    user.groupId = fields(3)
    users << user
  fi
next row
? users

Error: RTE-ERROR AT untitled.bas:7 *
Description:
Array: Index '1' out of range. (Max = 1)

(Note: I changed the HTML codes for less-than, to << in the code to get it to work)

As a workaround, I changed LEN to UBOUND and the code worked fine.