Error : Serialisation of JS 'undefined' type is not supported by d-bus

Error : Serialisation of JS ‘undefined’ type is not supported by d-bus

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Getting recently this fault in the debug on the victron node gridpoint.

Was working perfect in the past. The data sended to the node is a integer.

Base off the problem is clearly that a global variable wasn’t written.
Could not find it in the variables list ; suddenly it came back en then the fault is off course gone.