I get "_poll(): pcb is NULL" in mqttClient.connect();

[matsekberg]

[ 16371][I][network.cpp:192] connectToMqtt(): [NET] Connecting to MQTT 10.0.1.50...
[ 16629][W][AsyncTCP.cpp:949] _poll(): pcb is NULL
[ 17129][W][AsyncTCP.cpp:949] _poll(): pcb is NULL
[ 17629][W][AsyncTCP.cpp:949] _poll(): pcb is NULL
[ 18129][W][AsyncTCP.cpp:949] _poll(): pcb is NULL
[ 18629][W][AsyncTCP.cpp:949] _poll(): pcb is NULL
[ 19130][W][AsyncTCP.cpp:949] _poll(): pcb is NULL
[ 19629][W][AsyncTCP.cpp:949] _poll(): pcb is NULL
[ 20129][W][AsyncTCP.cpp:949] _poll(): pcb is NULL
[ 20629][W][AsyncTCP.cpp:949] _poll(): pcb is NULL
[ 21129][W][AsyncTCP.cpp:949] _poll(): pcb is NULL
[ 24356][I][network.cpp:199] onMqttConnect(): [NET] Connected to MQTT broker: 10.0.1.50

Compiling using arduino ide for esp32-s3.
Using library AsyncMQTT_ESP32 for MQTT.