Line chart - presenting nulls as zeros

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Hi,

I've inserted a line chart to my form. It gets data from database (4 columns). 2 columns are presented on a chart as data series. Sometimes there are nulls in one of the columns. Then Webcon interpreters it as 0. Do you know any countermeasures to it? If there is a null value from the database, then it shouldn't show that line at the given point in time.

I attach a photo of that such graph with nulls as zeros.

Would be grategul for your help.