diff --git a/app.py b/app.py
index b9e735f..ef4c72f 100644
--- a/app.py
+++ b/app.py
@@ -162,7 +162,6 @@ def extract(driver, username: str, password: str):
         historial_html_io = StringIO(f"<table>{historial_html}</table>")
         materias_html_io = StringIO(f"<table>{materias_actuales_html}</table>")
         df = pd.read_html(historial_html_io)[0]
-        df_materias = pd.read_html(materias_html_io)[0]
         
         json_result = None
         json_materias = None
@@ -171,6 +170,7 @@ def extract(driver, username: str, password: str):
             df['PERIODO'] = df['PERIODO'].apply(lambda x: str(x).replace('.0', '') if isinstance(x, (float, int)) else x)
             json_result = df[df['GRUPO'] != 'Promedio:'].to_json(orient='records')
         
+        df_materias = pd.read_html(materias_html_io)[0]
         json_materias = df_materias.to_json(orient='records')