Freeze when using custom LWIP Netif driver

[Harvie]

Hello,
i am implementing my own NIC driver for LWIP on ESP32.

I am able to ping the device. If i try to open TCP connection to closed port, it does correctly reject it. If i try to connect to webserver on port 80, it does finish the TCP handshake, but as soon as i send HTTP request, the ESP32 freezes and in few seconds triggers the Task watchdog with following message:

[Apr 20 10:19:27.644] E (48144) task_wdt: Task watchdog got triggered. The following tasks did not reset the watchdog in time:
[Apr 20 10:19:27.652]  - mgos (CPU 1), backtrace: - mgos (CPU 1), backtrace:0x40080ADD 0x40088C22 0x40088CC5 0x40082AAA 0x40082B81 0x401009B6 0x40100A49 0x4012E875 0x400FC74C 0x4013136D 0x40131D7E 0x4013136D 0x401327D9 0x40134785 0x40134CA4 0x40134CDD 0x4013C559 0x4012D6C2 0x40082835 0x4008273F 
[Apr 20 10:19:27.677] 
[Apr 20 10:19:27.677] E (48144) task_wdt: Tasks currently running:
[Apr 20 10:19:27.682] E (48144) task_wdt: CPU 0: IDLE0
[Apr 20 10:19:27.685] E (48144) task_wdt: CPU 1: IDLE1
[Apr 20 10:19:27.688] E (48144) task_wdt: Aborting.
[Apr 20 10:19:27.693] 
[Apr 20 10:19:27.693] abort() was called at PC 0x400d0e8a on core 0
[Apr 20 10:19:27.696] 
[Apr 20 10:19:27.696] Backtrace:0x40085cca |<-CORRUPTED

I don't have WIFI or any other NIC configured.
I just load my lwip netif driver and configure IP adress using netif_add(...); netif_set_up(...);
That should be enough, because on lwip side everything seems to be working.

Perhaps the mongoose http server has some hardcoded reference to wifi interface which is not loaded when i use my custom NIC instead? That might be causing the crash...