diff --git a/packages/modules/devices/sonnen/sonnenbatterie/api.py b/packages/modules/devices/sonnen/sonnenbatterie/api.py
index 55a3f232b7..462e486cb1 100644
--- a/packages/modules/devices/sonnen/sonnenbatterie/api.py
+++ b/packages/modules/devices/sonnen/sonnenbatterie/api.py
@@ -355,7 +355,7 @@ def update_battery(self, sim_counter: SimCounter) -> BatState:
         # the current is calculated as apparent power / voltage
         battery_ac_voltage = battery_state["Uac"]
         currents = [float(battery_state[f"Sac{phase}"]) / battery_ac_voltage
-                    if battery_state[f"Sac{phase}"] else None
+                    if battery_state.get(f"Sac{phase}") else None
                     for phase in range(1, 4)]
         imported, exported = sim_counter.sim_count(battery_power)
         return BatState(power=battery_power,