Image forming apparatus with finishing unit

An image forming apparatus, comprising:

• a finisher configured to perform at least one finisher processing on a ream of paper on which images have been formed;
• a conveying unit configured to convey the papers on which images have been formed to the finisher;
• a stacking unit configured to stack the papers that are consecutively conveyed by the conveying unit at a processing position where the finisher processing is performed, wherein the stacking unit is configured to stack the papers in such a manner that a portion of the papers is exposed to an outside of the image forming apparatus;
• a discharging unit configured to cause the finisher to perform the finisher processing on the ream of paper when a predetermined number of papers have been stacked at the processing position in the stacking unit, and to discharge the ream of paper on which finisher processing has been performed to a discharge tray;
• and
• a detecting unit configured to detect a presence or absence of paper at the processing position in the stacking unit,
• wherein
• (1) if an execution of the finisher processing is designated, (2) there is no discharging operation of papers by the discharging unit, and (3) if, prior to execution of the finisher processing, the detecting unit detects an absence of paper in the stacking unit, then the image forming apparatus does not recognize that a paper jam has occurred and an image forming operation of the image forming apparatus is continued.