@AndreGraca Unfortunately, this workaround would not help if the AssertionError did not arise from the Only process this many movies parameter.
An alternative cause for the error could be the input of movies without any associated particles. You may test for (and correct) this condition by connecting particles (in addition to rigid/patch-corrected micrographs) to a Manually Curate Exposures job that precedes Local Motion Correction.
Does this condition apply in your case?