diff --git a/libra_toolbox/tritium/lsc_measurements.py b/libra_toolbox/tritium/lsc_measurements.py
index ec2b8e3..3511d93 100644
--- a/libra_toolbox/tritium/lsc_measurements.py
+++ b/libra_toolbox/tritium/lsc_measurements.py
@@ -76,6 +76,8 @@ def substract_background(self, background_sample: "LSCSample"):
     @staticmethod
     def from_file(file_reader: LSCFileReader, vial_name):
         values = file_reader.get_bq1_values_with_labels()
+        if vial_name not in values:
+            raise ValueError(f"Vial {vial_name} not found in the file reader.")
         activity = values[vial_name] * ureg.Bq
         return LSCSample(activity, vial_name)
 
diff --git a/test/tritium/test_lsc_samples.py b/test/tritium/test_lsc_samples.py
index 1fe6577..c3a2760 100644
--- a/test/tritium/test_lsc_samples.py
+++ b/test/tritium/test_lsc_samples.py
@@ -60,3 +60,31 @@ def test_lscsample_from_file():
     sample = LSCSample.from_file(file_reader, "Sample1")
     assert sample.activity == 0.334 * ureg.Bq
     assert sample.name == "Sample1"
+
+
+def test_lscsample_from_file_when_not_found():
+    file_reader = LSCFileReader(
+        Path(__file__).parent / "TEST_CSV.csv",
+        vial_labels=[
+            "1L-OV-1-0-1",
+            "1L-OV-1-0-2",
+            "1L-OV-1-0-3",
+            "1L-OV-1-0-4",
+            None,
+            "1L-IV-1-0-1",
+            "1L-IV-1-0-2",
+            "1L-IV-1-0-3",
+            "1L-IV-1-0-4",
+            None,
+            "Sample1",
+            "1L-IV-1-1-2",
+            "1L-IV-1-1-3",
+            "1L-IV-1-1-4",
+        ],
+    )
+
+    file_reader.read_file()
+    with pytest.raises(
+        ValueError, match="Vial coucoucou not found in the file reader."
+    ):
+        LSCSample.from_file(file_reader, "coucoucou")