skipping syntax lines

I am using lotus script to embedded an Excel object. The script is
doing a loop (10 times). It process the data and embeds the Excel
object to the document, but next document does not embed the object
and process data. On the third loop, it processs the data and embed
the Excel object. Sometimes it will process alternate time
(1,3,5,7,9). I inserted print lines to code to see what is
happening. It seems to skip a line in the code (Set object =
rtitem.EmbedObject(EMBED_OBJECT,"",ExcelFileName$,"Analysis"), but
when I insert a message box line before this line it runs correctly.
The only problem with this is user has to click ok button of the
message box 10 times. I have used Sleep() syntax, but it did not
work. Is there a way to for the script to stop skipping the line.
Any suggestions will be helpful. Thanks.