DHL Adapter Shipping Label - The article has no weight issue

Hi, 

On my shop there is a DHL adapter to print shipping labels. But the problem is that when I try to print the shipping label for some items the plugin works perfectly but for some it say article weight is not defined hence it will be assumed 0,1 kg but the article weight is defined for every item out there. Does anybody faced the same issue? The DHL adapter don’t get back to me. Any help would be appreciated. 

 

Thanks