assertion 'g_utf8_validate (string, -1, NULL)' failed

[José]

Hi, I am working with Telit LE910. It works properly with ModemManager
using QMI, but if I disable and enable the modem again, I get the following:

root at ccimx6sbc:~# mmcli -m 0 -e

ModemManager[698]: <info>  Modem
/org/freedesktop/ModemManager1/Modem/0: state changed (disabled ->
enabling)

ModemManager[698]: <warn>  (ttyUSB2): port attributes not fully set

ModemManager[698]: <warn>  (ttyUSB3): port attributes not fully set

ModemManager[698]: <info>  Modem
/org/freedesktop/ModemManager1/Modem/0: 3GPP Registration state
changed (unknown -> registering)



(ModemManager:698): GLib-CRITICAL **: g_variant_new_string: assertion
'g_utf8_validate (string, -1, NULL)' failed



(ModemManager:698): GLib-CRITICAL **: g_variant_ref_sink: assertion
'value != NULL' failed

ModemManager[698]: <info>  Modem
/org/freedesktop/ModemManager1/Modem/0: 3GPP Registration state
changed (registering -> home)

ModemManager[698]: Couldn't read SMS messages: QMI protocol error
(17): 'MissingArgument'

ModemManager[698]: Couldn't read SMS messages: QMI protocol error
(52): 'DeviceNotReady'

ModemManager[698]: Couldn't read SMS messages: QMI protocol error
(48): 'InvalidArgument'

ModemManager[698]: Couldn't read SMS messages: QMI protocol error
(48): 'InvalidArgument'

ModemManager[698]: Couldn't read SMS messages: QMI protocol error
(17): 'MissingArgument'

ModemManager[698]: Couldn't read SMS messages: QMI protocol error
(52): 'DeviceNotReady'

ModemManager[698]: Couldn't read SMS messages: QMI protocol error
(48): 'InvalidArgument'

ModemManager[698]: Couldn't read SMS messages: QMI protocol error
(48): 'InvalidArgument'

ModemManager[698]: <info>  Modem
/org/freedesktop/ModemManager1/Modem/0: state changed (enabling ->
registered)

successfully enabled the modem


Why are those asserts coming out? How can I fix those?
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