human
Solve the following python programming problem given the following code:
def _crawl(self, link_or_links, follow_links) : 
    (links, seen) = (set (), set ()) 
    queue = Queue () 
    converged = threading.Event () 
    def execute() : 
        while (not converged.is_set ()) : 
            try : 
                link = queue.get (timeout = 0.01) 
except Empty : 
                continue 
if (link not in seen) : 
                seen.add (link) 
                try : 
                    (roots, rels) = self.crawl_link (self.context, link) 
except Exception as e : 
                    TRACER.log (('Unknown exception encountered: %s' % e)) 
                    for line in traceback.format_exc ().splitlines () : 
                        TRACER.log (line) 
queue.task_done () 
                    continue 
links.update (roots) 
                if follow_links : 
                    for rel in rels : 
                        if (rel not in seen) : 
                            queue.put (rel) 
queue.task_done () 
for (i, link) in enumerate (link_or_links) : 
        TRACER.log (('crawling link i=%s link=%s follow_links=%s' % (i, link, follow_links)), V = 3) 
        queue.put (link) 
workers = [] 
    for _ in range (self._threads) : 
        worker = threading.Thread (target = execute) 
        workers.append (follow_links) 
        worker.daemon = True 
        worker.start () 
queue.join () 
    converged.set () 
    return links 

    
    

    Fix the buggy line: workers.append (follow_links)
assistant
#Here is Python program to fix the buggy line: workers.

workers.append (worker)