diff --git a/machine_learning/dimensionality_reduction.py b/machine_learning/dimensionality_reduction.py
index 6080d0a4f11f..3912a9d9cf5e 100644
--- a/machine_learning/dimensionality_reduction.py
+++ b/machine_learning/dimensionality_reduction.py
@@ -143,7 +143,7 @@ def linear_discriminant_analysis(
     assert classes > dimensions
 
     # Check if features have been already loaded
-    if features.any:
+    if features.any():
         _, eigenvectors = eigh(
             covariance_between_classes(features, labels, classes),
             covariance_within_classes(features, labels, classes),
@@ -363,6 +363,11 @@ def test_linear_discriminant_analysis() -> None:
             )
         assert error_info.type is AssertionError
 
+    with pytest.raises(AssertionError):
+        linear_discriminant_analysis(
+            np.array([]), np.array([]), classes=2, dimensions=1
+        )
+
 
 def test_principal_component_analysis() -> None:
     features = np.array([[1, 2, 3], [4, 5, 6], [7, 8, 9]])