nil mystery

[ToddAndMargo]

Hi All,

These two throw an operating on a "Nil" error:
    $PartsStr ~= "$PartNo<br>";
    $PartsStr ~= "{$PartNo}<br>";


But this does not:
    $PartsStr ~= "{$PartNo}" ~ "<br>";


And this does not either:
    $PartsStr ~= "abcde<br>";

Huh?


Many thanks,
-T

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