I get this error too. I find it after upgrade Zigbee2Mqtt to v 2.0.0.
I have found a strange illuminance value (very long numeric sequence with decimal) on a Hue Sensor. I think that it is this one, but I do not kwow to solve it.
I have already tried to reconfigure it and nothing.
EDITED: I find the way. Once you find the device with strange string for illuminance value, then go in specific settings and insert 0 in Illuminance calibration. I solve in this way.