nil value in VD

[cashe 8]

Here the simple VD code:

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It is looped and working well but sometimes for some reason VD gets an error with a nil value for some variable (temp or pump).

 

Here on a screenshot

 

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Why the variable gets nil value?

How do I handle such error?

 

Thank you!

 

 

[Siddler 4]

To avoid the error, and a check before the problem line executes.  E.g.
 

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I don't know why it would happen.  Maybe a Z-wave comms issue.  What does the fibaro:getValue(tenpId, "value") return - i.e. before the tonumber function is called?  Maybe it returns a bad-text which the tonumber function cannot handle, and so returns nil.

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