Fortunately Kahlbaum prevented serious error by leaving the prognosis of his catatonia open.
Taxonomic zeal began to blind vision when Kahlbaum formulated his "catatonia" and included stupor in the symptom complex.
It is true that it is frequent in catatonia but is not exclusively there.
Then you can check your notes and decide if it's schizophrenia, or catatonia, or psychasthenia, or what not.
catatonia cat·a·to·ni·a (kāt'ə-tō'nē-ə)
An abnormal condition often associated with schizophrenia and variously characterized by stupor, stereotypy, mania, and either rigidity or extreme flexibility of the limbs.