diff --git a/src/ert/data/_measured_data.py b/src/ert/data/_measured_data.py
index d4db19ce067..eb4afdc27c5 100644
--- a/src/ert/data/_measured_data.py
+++ b/src/ert/data/_measured_data.py
@@ -13,6 +13,8 @@
 import numpy as np
 import pandas as pd
 
+from ert.realization_state import RealizationState
+
 if TYPE_CHECKING:
     import numpy.typing as npt
 
@@ -103,10 +105,13 @@ def _get_data(
             group, obs = observations.get_dataset(key)
             try:
                 response = ensemble.load_response(
-                    group, tuple(range(self._facade.get_ensemble_size()))
+                    group, tuple(ensemble.realization_list(RealizationState.HAS_DATA))
                 )
-            except KeyError:
-                raise ResponseError(f"No response loaded for observation key: {key}")
+                _msg = f"No response loaded for observation key: {key}"
+                if not response:
+                    raise ResponseError(_msg)
+            except KeyError as e:
+                raise ResponseError(_msg) from e
             ds = obs.merge(
                 response,
                 join="left",
diff --git a/tests/unit_tests/gui/test_full_manual_update_workflow.py b/tests/unit_tests/gui/test_full_manual_update_workflow.py
index 8ed7c7a470f..1b8e9523e38 100644
--- a/tests/unit_tests/gui/test_full_manual_update_workflow.py
+++ b/tests/unit_tests/gui/test_full_manual_update_workflow.py
@@ -5,6 +5,7 @@
 from qtpy.QtCore import Qt, QTimer
 from qtpy.QtWidgets import QApplication, QComboBox, QMessageBox, QPushButton, QWidget
 
+from ert.data import MeasuredData
 from ert.gui.ertwidgets.caselist import CaseList
 from ert.gui.simulation.ensemble_experiment_panel import EnsembleExperimentPanel
 from ert.gui.simulation.run_dialog import RunDialog
@@ -129,6 +130,9 @@ def handle_dialog():
     df_prior = facade.load_all_gen_kw_data(storage.get_ensemble_by_name("iter-0"))
     df_posterior = facade.load_all_gen_kw_data(storage.get_ensemble_by_name("iter-1"))
 
+    # Making sure measured data works with failed realizations
+    MeasuredData(facade, storage.get_ensemble_by_name("iter-0"), ["POLY_OBS"])
+
     # We expect that ERT's update step lowers the
     # generalized variance for the parameters.
     assert (