Seg. Fault returning an empty sequence

Hello,

I have a sequence definition inside a Slice file:

sequence<Shape> ShapeList;

and the next interface in the same file:

interface GrDebugProvider
{
   ShapeList getGrDebug();
};

I generate the C++ code and the class that implements the previous interface contains the following code:

bica::ShapeList
Debug::getGrDebug(const Ice::Current& c)
{
	bica::ShapeList shapeList;

	// (*) Add a dummy shape first, if the list is empty Ice crashes ¿?
	//shapeList.push_back(getTestShape());

	return shapeList;
}

When I call this method from a proxy (written in Java) I obtain segmentation fault inside the ice object called. This is the gdb output:

0x00faeb66 in IceInternal::BasicStream::WriteEncaps::ObjectWriteEncaps::toBeMarshaledMap (this=0x0) at ../../include/IceE/BasicStream.h:743
743	            PtrToIndexMap* toBeMarshaledMap() { return reinterpret_cast<PtrToIndexMap*>(_toBeMarshaledMap); }

However, uncommenting the line marked with (*) everything goes smooth. So, the problem seems to be return an empty sequence. I am using Ice 3.3.1 in the client side (Java) and Icee 1.3.0 in the server side (C++), Ubuntu 10.10 and gcc 4.4.5.

Any ideas for how to solve this issue? Is there any kind of limitation related with empty sequences?

Thanks in advance,
Carlos