QPR’s 17 shots, with nine on target, compared to only two for the away side – who did not register an effort on Pierce Charles’ goal.
The frustration will be most acutely felt by Kone and Vale, who were each denied by Bonham on four occasions.
In a bid to break the deadlock, Stephan made a quadruple change – including debuts for summer signings Dennis Cirkin and Tariq Lamptey – but there was no way through.
While QPR were left with regrets, Steven Schumacher’s Bolton, promoted as League One play-off winners last season, will be delighted with the start they have made on their return to the second tier after a seven-year absence – taking four points from their first two league matches.