sfinv_only mode does not work with progressive_mode

Steps to reproduce:

Install Minetest Game + craftguide
Enable craftguide_sfinv_only and craftguide_progressive_mode
Start the game -> the crafting guide is empty at begining
Touch sand block -> Glas block or sandstone appears in inventory
Select glas block or sandstone
Select Recipe output to switch to the usages

Result:

2020-01-22 07:54:37: ERROR[Main]: ServerError: AsyncErr: ServerThread::run Lua: Runtime error from mod 'sfinv' in callback on_playerReceiveFields(): /home/user/.minetest/mods/craftguide/init.lua:938: attempt to get length of field 'dat' (a nil value)
2020-01-22 07:54:37: ERROR[Main]: stack traceback:
2020-01-22 07:54:37: ERROR[Main]:   /home/user/.minetest/mods/craftguide/init.lua:938: in function 'get_panels'
2020-01-22 07:54:37: ERROR[Main]:   /home/user/.minetest/mods/craftguide/init.lua:1110: in function 'make_formspec'
2020-01-22 07:54:37: ERROR[Main]:   /home/user/.minetest/mods/craftguide/init.lua:1641: in function 'get_formspec'
2020-01-22 07:54:37: ERROR[Main]:   ...e/user/.minetest/games/minetest_game/mods/sfinv/api.lua:119: in function 'set_player_inventory_formspec'
2020-01-22 07:54:37: ERROR[Main]:   /home/user/.minetest/mods/craftguide/init.lua:1119: in function 'show_fs'
2020-01-22 07:54:37: ERROR[Main]:   /home/user/.minetest/mods/craftguide/init.lua:1625: in function 'fields'
2020-01-22 07:54:37: ERROR[Main]:   /home/user/.minetest/mods/craftguide/init.lua:1657: in function </home/belka/.minetest/mods/craftguide/init.lua:1656>
2020-01-22 07:54:37: ERROR[Main]:   /usr/share/minetest/builtin/game/register.lua:429: in function </usr/share/minetest/builtin/game/register.lua:413>

minetest-mods / craftguide

sfinv_only mode does not work with progressive_mode #97