Add Product of the day and others on products page

Hello

I've been trying to add

product of the day + random products

on the same page and in a left column than the page displaying a product.

for the main page I use a file "header_index.php" and for product i use a "header.php" on this file i want a left column with the product of the day and random products which I already have on the "header_index.php" without problem.

When using the same tags on "header.php" the product of the day/ random products are displayed ok in my left column but in the right column where the product shows up I always have:

Invalid argument supplied for foreach() in
...html/product.php on line 37

below I have related products showing up ok.

I believe there is a conflict between variables names but I have no idea how to fix the problem.

Any idea what I can do?

Thanks

Pat