Well, there were always some bodyguards around in Hitler’s presence.
Furthermore, needless to say why, no weapons were allowed in the presence of the dictator (as could be assumed with any other tyrant as well :-)).
Needless to say, this was not shown on propaganda photos.
All crows under the sky are black, as the Chinese say. Not just in this regard...
One attempt though never carried out was to have been during a presentation of some new uniforms a German officer with a bomb in his uniform was supposed to blow himself and Hitler up but it was never carried out. Another attempt was made on Hitler's private plane with two bottles of mineral water fitted with a British made fuse that was supposed to explode when the plane reached a certain altitude but the plane never reached the required altitude for the fuses to work. The guy had the devil's own luck for sure.