Code:
var isplaceobject;
function spawn()
{
	isplaceobject = 1;

	while(...)
	{
		... // other code


You also need to move the "wait(1);" outside the if-branching, as it will otherwise produce a crash if the trace hits nothing or hits an object from the inside.

I don't know why you're getting more than 1 cubes, maybe you're calling the function more than once at the same time?

Also add a break; or return; here:
Code:
if(ghostobject != NULL)
			{
				ent_remove(ghostobject);
				isplaceobject = 0;
				return;
			}


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