human
Solve the following python programming problem given the following code:
def get_change_log(user = None) : 
    if (not user) : 
        user = frappe.session.user 
last_known_versions = frappe._dict (json.loads ((frappe.db.get_value ('User', user, 'last_known_versions') or '{}'))) 
    current_versions = get_versions () 
    if (not last_known_versions) : 
        update_last_known_versions () 
        return [] 
change_log = [] 
    def set_in_change_log(app, opts, change_log) : 
        from_version = (last_known_versions.get (app, { 
            
}).get ('version') or '0.0.1') 
        to_version = opts ['version'] 
        if (from_version != to_version) : 
            app_change_log = get_change_log_for_app (app, from_version = from_version, to_version = to_version) 
            if app_change_log : 
                change_log.append ({ 
                    'title' : opts ['title'], 
                    'description' : opts ['description'], 
                    'version' : to_version, 
                    'change_log' : app_change_log, 
}) 
for (app, opts) in current_versions.items () : 
        if (app != 'frappe') : 
            set_in_change_log (app, set_in_change_log, change_log) 
if ('frappe' in current_versions) : 
        set_in_change_log ('frappe', current_versions ['frappe'], change_log) 
return change_log 

    
    

    Fix the buggy line: set_in_change_log (app, set_in_change_log, change_log)
assistant
#Here is Python program to fix the buggy line: set_in_change_log (app, set_in_change_log, change_log)
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set_in_change_log (app, opts, change_log)