Hi,

I am developping some source code using a boost shared pointer
gr_message_sptr 
which is retrieving from a queue (gr_msg_queue_sptr),
The issue is that when calling :

 gr_message_sptr mesg = queue->delete_head_nowait();  

from within a while loop (BTW the queue itself is being passed from a thread
function to a subsequent function which process it), 

I got an error stated as:

... /usr/include/boost/smart_ptr/shared_ptr.hpp:424: T*
boost::shared_ptr<T>::operator->() const [with T = gr_message]: Assertion
`px != 0' failed.
Aborted (core dumped),
Even after googling the issue I got no clear explanation of am I doing wrong
or missing. 

All clarifications are welcome, thank you,

Regards,



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