diff --git a/gestionatr/input/messages/B70.py b/gestionatr/input/messages/B70.py
index cc9d636..c4e8991 100644
--- a/gestionatr/input/messages/B70.py
+++ b/gestionatr/input/messages/B70.py
@@ -1389,7 +1389,7 @@ def get_lectures_info(self):
                 # Normalment es 1 pero pot no ser-ho. Aixó es una mandanga per no ahver de treballar amb la zeta.
                 consum_calculat_sefons_fomrula = round(vals['consum_m3'] * vals['pcs'] * vals['factor_k'], 3)
                 consum_calculat_segons_factor = round(vals['consum'], 3)
-                if consum_calculat_segons_factor != consum_calculat_sefons_fomrula:
+                if consum_calculat_segons_factor != consum_calculat_sefons_fomrula and vals['pcs']:
                     consum_calculat = round(vals['consum_m3'] * meter.factorconver, 3)
                     if consum_calculat_segons_factor == consum_calculat:
                         vals['factor_k'] = meter.factorconver / vals['pcs']
@@ -1400,7 +1400,7 @@ def get_lectures_info(self):
                 # ultima lectura
                 # Per tant: si el consum facturat per la distri no coincideix amb el consum calculat, ero aplicant
                 # el faactor de conversio del ultim dia siq ue aplica, recalculem el factor k perque quadri tot.
-                if consum_kwh_facturat != consum_calculat_segons_factor:
+                if consum_kwh_facturat != consum_calculat_segons_factor and vals['pcs']:
                     if not factor_ultima_lectura and self.meters[-1].factorconver:
                         factor_ultima_lectura = float(self.meters[-1].factorconver)
                     if factor_ultima_lectura: