Changing bitrate is breaking liquisoap (1.9.1)

###########################################
# Liquidsoap config file                  #
###########################################

###########################################
# Output settings                         #
###########################################
output_sound_device = false
output_icecast_vorbis = false
output_icecast_mp3 = true
output_shoutcast = false

# output_bitrate = 192
# output_samplerate = 44100
# output_stereo = true

###########################################
# Logging settings                        #
###########################################
log_file = "/var/log/airtime/pypo-liquidsoap/<script>.log"
#log_level = 3

###########################################
# Icecast Stream settings                 #
###########################################
icecast_host = "127.0.0.1"
icecast_port = 8000
icecast_pass = "*************"

# Icecast mountpoint names
mount_point_mp3 = "radio"
mount_point_vorbis = "airtime.ogg"

# Webstream metadata settings
icecast_url = "http://airtime.sourcefabric.org"
icecast_description = "Airtime Radio!"
icecast_genre = "genre"

# Audio stream metadata for vorbis/ogg is disabled by default
# due to a number of client media players that disconnect
# when the metadata changes to a new track. Some versions of
# mplayer and VLC have this problem. Enable this option at your
# own risk!
output_icecast_vorbis_metadata = false

###########################################
# Shoutcast Stream settings               #
###########################################
shoutcast_host = "127.0.0.1"
shoutcast_port = 9000
shoutcast_pass = "testing"

# Webstream metadata settings
shoutcast_url = "http://airtime.sourcefabric.org"
shoutcast_genre = "genre"