diff --git a/khiops/core/internals/runner.py b/khiops/core/internals/runner.py
index 7262bd28..0191e99a 100644
--- a/khiops/core/internals/runner.py
+++ b/khiops/core/internals/runner.py
@@ -746,6 +746,13 @@ def _report_exit_status(
                     f"Khiops ended correctly but there were minor issues:\n{error_msg}"
                 )
                 warnings.warn(error_msg.rstrip())
+        else:
+            # no message available, an error must be raised though
+            if return_code != 0:
+                raise KhiopsRuntimeError(
+                    f"{tool_name} execution had errors (return code {return_code}) "
+                    "but no message is available\n"
+                )
 
     def _collect_errors(self, log_file_path):
         # Collect errors any errors found in the log
diff --git a/tests/test_core.py b/tests/test_core.py
index 9fc3dcde..f684739d 100644
--- a/tests/test_core.py
+++ b/tests/test_core.py
@@ -18,6 +18,7 @@
 
 import khiops
 import khiops.core as kh
+from khiops.core import KhiopsRuntimeError
 from khiops.core.internals.common import create_unambiguous_khiops_path
 from khiops.core.internals.io import KhiopsOutputWriter
 from khiops.core.internals.runner import KhiopsLocalRunner, KhiopsRunner
@@ -2691,6 +2692,24 @@ def test_khiops_environment_variables_basic(self):
                 else:
                     os.environ[fixture["variable"]] = old_value
 
+    def test_raise_exception_on_error_case_without_a_message(self):
+        with self.assertRaises(KhiopsRuntimeError):
+            with MockedRunnerContext(
+                create_mocked_raw_run(
+                    False,  # ask for an empty stdout
+                    False,  # ask for an empty stderr
+                    9,  # non-zero error code
+                )
+            ):
+                kh.train_predictor(
+                    "/tmp/Iris.kdic",
+                    dictionary_name="Iris",
+                    data_table_path="/tmp/Iris.txt",
+                    target_variable="Class",
+                    results_dir="/tmp",
+                    trace=True,
+                )
+
 
 if __name__ == "__main__":
     unittest.main()