Null byte as LCD text causes error

[debagos]

Issue

A player on my server is using a null byte to flush a Digilines LCD screen, which results in the mapserver shutting down with the following error: panic: pq: invalid byte sequence for encoding "UTF8": 0x00

Related issue: #113

Mapserver log

time="2026-05-07T14:38:05+02:00" level=error msg="AddMapData()" mbpos="&{688 0 -1345}" obj="&{0xe88a8805c20 11013 15 -21511 digilinelcd 1778157485 map[channel:lcd text:\x00]}" prefix=mapobject type="digilines:lcd" x=5 y=15 z=9
panic: pq: invalid byte sequence for encoding "UTF8": 0x00
goroutine 99 [running]:
mapserver/mapobject.(*Listener).OnEvent.func2(...)
        /home/juri/github/mapserver/mapobject/listener.go:129
mapserver/coords.IterateMapblock(...)
        /home/juri/github/mapserver/coords/iterate_mapblock.go:9
mapserver/mapobject.(*Listener).OnEvent(0xe889cc32060, {0xe2892d?, 0x10?}, {0xd0bb40, 0xe88a0900c60})
        /home/juri/github/mapserver/mapobject/listener.go:100 +0xa6e
mapserver/eventbus.(*Eventbus).Emit(0xe88aaf59000?, {0xe2892d, 0x11}, {0xd0bb40, 0xe88a0900c60})
        /home/juri/github/mapserver/eventbus/eventbus.go:35 +0xc8
mapserver/mapblockaccessor.(*MapBlockAccessor).FindMapBlocksByMtime(0xe889cc0d860, 0x19e0271e6bc, 0x61a8, {0xe889cc101d0, 0x1, 0x1bb4680?})
        /home/juri/github/mapserver/mapblockaccessor/mtime.go:79 +0xa75
mapserver/tilerendererjob.incrementalRender(0xe889cd10000)
        /home/juri/github/mapserver/tilerendererjob/incremental.go:27 +0x1b7
mapserver/tilerendererjob.Job(0xe889cd10000)
        /home/juri/github/mapserver/tilerendererjob/job.go:27 +0x4c
created by main.main in goroutine 1
        /home/juri/github/mapserver/main.go:77 +0x35a

Software

Mapserver version: dev e76755d
OS: linux
Architecture: amd64

To reproduce this issue

• Install and activate the following mods:
  • mesecons
  • digilines
• Place a digilines:lcd node and set the channel to lcd
• Place a mesecons_microcontroller:microcontroller0000 and connect it to the LCD with digilines
• Put in the following code in the Lua controller:

if event.type == "program" then
	digiline_send("lcd", string.char(0))
end

• Now watch the mapserver shutting down with the above error