diff --git a/py_wake/tests/test_wind_farm_models/test_enginering_wind_farm_model.py b/py_wake/tests/test_wind_farm_models/test_enginering_wind_farm_model.py
index 8d4c83264db902db3e3868fbf47e31fe7dd51535..f0fda5b0576b51ab61941a9a035af034950bdd41 100644
--- a/py_wake/tests/test_wind_farm_models/test_enginering_wind_farm_model.py
+++ b/py_wake/tests/test_wind_farm_models/test_enginering_wind_farm_model.py
@@ -440,6 +440,28 @@ def test_time_series_operating():
     npt.assert_array_equal(sim_res.Power.values[operating != 0] > 0, True)
 
 
+def test_time_series_operating_wrong_shape():
+    from py_wake.wind_turbines.power_ct_functions import PowerCtFunctionList, PowerCtTabular
+    d = np.load(os.path.dirname(examples.__file__) + "/data/time_series.npz")
+    wd, ws, ws_std = [d[k][:6 * 24] for k in ['wd', 'ws', 'ws_std']]
+    ws += 3
+    t = np.arange(6 * 24)
+    wt = V80()
+    site = Hornsrev1Site()
+
+    # replace powerCtFunction
+    wt.powerCtFunction = PowerCtFunctionList(
+        key='operating',
+        powerCtFunction_lst=[PowerCtTabular(ws=[0, 100], power=[0, 0], power_unit='w', ct=[0, 0]),  # 0=No power and ct
+                             wt.powerCtFunction],  # 1=Normal operation
+        default_value=1)
+    wfm = NOJ(site, wt)
+    x, y = site.initial_position.T
+    operating = (t < 48) | (t > 72)
+    with pytest.raises(ValueError, match=r"Argument, operating\(shape=\(1, 144\)\), has unsupported shape."):
+        wfm(x, y, ws=ws, wd=wd, time=t, operating=[operating])
+
+
 def test_aep_wind_atlas_method():
     site = Hornsrev1Site()
 
diff --git a/py_wake/wind_farm_models/engineering_models.py b/py_wake/wind_farm_models/engineering_models.py
index 1149eb06aaf34b6b65c195de3e308475d6588eb3..7326be5517e74fcd3d09047ac1b2eb4846f6fe45 100644
--- a/py_wake/wind_farm_models/engineering_models.py
+++ b/py_wake/wind_farm_models/engineering_models.py
@@ -481,7 +481,6 @@ class PropagateDownwind(EngineeringWindFarmModel):
                     return v[i_wd_l]
                 else:
                     valid_shapes = f"(), ({I}), ({I},{L}), ({I},{L},{K}), ({L}), ({L},{K})"
-
                     raise ValueError(
                         f"Argument, {k}(shape={v.shape}), has unsupported shape. Valid shapes are {valid_shapes}")
             keys = self.windTurbines.powerCtFunction.required_inputs + self.windTurbines.powerCtFunction.optional_inputs