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Scene Error - attempt to compare number with nil





I've got a graphic block scene that check the lux levels, motion and colour of RGBW lights.  Screenshot attached


However every so often I'm getting this error:-



Kitchen Dim On [id: 39]
[ ERROR ] 10:45:07: 2019-12-23 10:45:07.622610 [  fatal] Unknown exception: /opt/fibaro/scenes/39.lua:14: attempt to compare number with nil


If I convert the graphic block to LUA this is what it looks like,  do I need to handle nil values when tonumber does not work?


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Thanks for any help whatsoever,



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