Doc.MainFlowInDoc has Name = null

Question

Dear friends,
The following snippet reports null for the name of the MainFlow in my testfile.

var oDoc  = app.ActiveDoc; // Name = ...\Allerlei.fm
var oFlow = oDoc.MainFlowInDoc; // Name = null - should IMHO be A
var oPgf = oFlow.FirstTextFrameInFlow.FirstPgf;   // Name = null

Fo a newly created file the report is A - as expected.
→ How can this property disappear even after MIF washing? In the UI of FM the flow is reported as A
That's the cause of my problems reported in this post.
→ I could recover from this strange situation by

Create a new document portrait
Import all styles from the existing
Copy all contents of flow A to the new doc

But the question remains: how this property can disappear - at least for the script.

frameexpert · Accepted Answer

This can happen if you have multiple tagged text frames on a master page, even if they are all A flows.

frameexpert · Answer

I usually get around this with a function where I can get the A flow text frame from the first page of the document. It usually doesn't matter if it is the MainFlowInDoc as long as it contains the main document contents.

var textFrame, pgf;

textFrame = getTextFrame (doc.FirstBodyPageInDoc, "A");
if (textFrame) {
    pgf = textFrame.FirstPgf;
}

function getTextFrame (page, flow) { 

    var frame, graphic;
    
    frame = page.PageFrame;
    graphic = frame.FirstGraphicInFrame;
    while (graphic.ObjectValid () === 1) {
        if (graphic.constructor.name === "TextFrame") {
            if (graphic.Flow.Name === flow) {
                return graphic;
            }
        }
        graphic = graphic.NextGraphicInFrame;
    }
}

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