It seems that using a different configuration prevents the segfault:
Section "InputDevice"
Identifier "Touchscreen1"
Driver "mutouch"
Option "Device" "/dev/ttyS0"
Option "screeno" "0"
Option "MinX" "16250"
Option "MaxX" "200"
Option "MinY" "200"
Option "MaxY" "16250"
Option "SwapXY"
Option "Portrait" "landscape"
Option "UntouchDelay" "3"
Option "ReportDelay" "1"
Option "Type" "finger"
EndSection
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