Script causes AE to Crash - any advice?

Question

I've been working on a script that would go and replace all media with a user-specified file extention with placeholders. The script works, but not long after the script completes, AE will crash. I'm not seeing what the script is doing that couled cause this. I was hoping someone might have a suggestion?

And, the showMsg function is because when I use alert, the message would not appear. But using my custom message box function generally works. (Not always though!)

----

var w = new Window("palette", "Offline Media", undefined);
w.add ('statictext', undefined, "Enter media file suffix (e.g., mxf):");
var nameWindow = w.add ("edittext");
nameWindow.characters = 30;
var sb = w.add("button", undefined, "Start");

w.show();

sb.onClick = offlineFunction;

function offlineFunction() {
try {
var name = nameWindow.text.toLocaleLowerCase();
var count = 0;

for (var i = 1; i <= app.project.numItems; i++) {
var footageItem = app.project.items[i];
if (footageItem instanceof FootageItem) {
var filename = footageItem.file.name;
var idx = filename.lastIndexOf(".");
if (idx > 0) {
var suffix = filename.slice(idx+1).toLocaleLowerCase();
if (suffix.localeCompare(name) == 0) {
count++;
fr = footageItem.frameRate;
if (fr < 1) fr = 1;
dur = footageItem.duration;
if (dur < 1) dur = 1;
footageItem.replaceWithPlaceholder(filename, footageItem.width, footageItem.height, fr, dur); // name, width, height, frameRate, duration)
}
}
}
}
var msg = "Offlined " + count + " media items.";
showMsg(msg);
} catch (e) {
var msg = "Exception! " + e;
showMsg(msg);
}
}

function showMsg(msg) {
var myWindow = new Window ("dialog");
var myMessage = myWindow.add ("statictext");
myMessage.text = msg;
myWindow.add("button", undefined, "OK").onClick = function(){myWindow.close();}
myWindow.show ( );
}

Alex White · Answer

Try this updated code:

var w = new Window("palette", "Offline Media", undefined);
w.add('statictext', undefined, "Enter media file suffix (e.g., mxf):");
var nameWindow = w.add("edittext");
nameWindow.characters = 30;
var sb = w.add("button", undefined, "Start");

w.show();

sb.onClick = offlineFunction;

function offlineFunction() {
    try {
        var name = nameWindow.text.toLowerCase();
        var count = 0;
        var errors = 0;

        for (var i = 1; i <= app.project.numItems; i++) {
            try {
                var footageItem = app.project.items[i];
                if (footageItem instanceof FootageItem && footageItem.file) {
                    var filename = footageItem.file.name;
                    if (filename) {
                        var idx = filename.lastIndexOf(".");
                        if (idx > 0) {
                            var suffix = filename.slice(idx + 1).toLowerCase();
                            if (suffix === name) {
                                count++;
                                var fr = footageItem.frameRate > 0 ? footageItem.frameRate : 1;
                                var dur = footageItem.duration > 0 ? footageItem.duration : 1;
                                footageItem.replaceWithPlaceholder(filename, footageItem.width, footageItem.height, fr, dur);
                            }
                        }
                    }
                }
            } catch (innerError) {
                errors++;
                $.writeln("Error processing item " + i + ": " + innerError.toString());
            }

            // Pause every 10 items to reduce strain on AE
            if (i % 10 === 0) {
                $.sleep(100); // Sleep for 100 milliseconds
            }
        }
        var msg = "Offlined " + count + " media items. Errors: " + errors;
        showMsg(msg);
    } catch (e) {
        showMsg("Exception! " + e.toString());
    }
}

function showMsg(msg) {
    var myWindow = new Window("dialog");
    var myMessage = myWindow.add("statictext");
    myMessage.text = msg;
    myWindow.add("button", undefined, "OK").onClick = function () {
        myWindow.close();
    }
    myWindow.show();
}

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