40Mhz Channel width, scanning for neighboring BSSes

[Robert Henning]

I am trying to get 40MHz channel width going.
But someone hostap isn't scanning for neighboring BSSes

the end of the output of hostapd -dd looks as follows :

hw vht capab: 0x0, conf vht capab: 0x0
wlan0: interface state UNINITIALIZED->HT_SCAN
Scan for neighboring BSSes prior to enabling 40 MHz channel
40 MHz affected channel range: [2392,2472] MHz
wlan0: nl80211: scan request
nl80211: Scan frequency 2412 MHz
nl80211: Scan frequency 2417 MHz
nl80211: Scan frequency 2422 MHz
nl80211: Scan frequency 2427 MHz
nl80211: Scan frequency 2432 MHz
nl80211: Scan frequency 2437 MHz
nl80211: Scan frequency 2442 MHz
nl80211: Scan frequency 2447 MHz
nl80211: Scan frequency 2452 MHz
nl80211: Scan frequency 2457 MHz
nl80211: Scan frequency 2462 MHz
Scan requested (ret=0) - scan timeout 10 seconds
Interface initialization will be completed in a callback
ctrl_iface not configured!

Maybe, cause the interface was already in master mode?
After hostapd starts, i am unable to scan as well, i have to use

iw dev wlan0 scan ap-force

Thanks in advance for any hints, on how to solve the problem