diff --git a/changes/159.fixed b/changes/159.fixed
new file mode 100644
index 0000000..c4fc890
--- /dev/null
+++ b/changes/159.fixed
@@ -0,0 +1 @@
+Fixed bug when accessing a jmespath integer or float.
diff --git a/jdiff/extract_data.py b/jdiff/extract_data.py
index 9190401..bcb1965 100644
--- a/jdiff/extract_data.py
+++ b/jdiff/extract_data.py
@@ -62,7 +62,7 @@ def extract_data_from_json(data: Union[Mapping, List], path: str = "*", exclude:
         raise TypeError("JMSPath returned 'None'. Please, verify your JMSPath regex.")
 
     # check for multi-nested lists
-    if any(isinstance(i, list) for i in values):
+    if isinstance(values, list) and any(isinstance(i, list) for i in values):
         # process elements to check if lists should be flattened
         for element in values:
             for item in element:
diff --git a/tests/test_get_value.py b/tests/test_get_value.py
index c185f28..3a5a1dd 100644
--- a/tests/test_get_value.py
+++ b/tests/test_get_value.py
@@ -173,3 +173,16 @@ def test_extract_data_from_json_with_ref_key_and_list_value():
     value = extract_data_from_json(data=data, path="[*].[$id$,include_trusted_domains]")
 
     assert value == expected_value, ASSERT_FAIL_MESSAGE.format(output=value, expected_output=expected_value)
+
+
+def test_extract_data_from_json_with_int_or_float_values():
+    """Verify that extract_data_from_json correctly handles ref-key paths when the extracted field value is an int or float."""
+    data = {"x": 5, "y": 0.75}
+
+    expected_value = 5
+    value = extract_data_from_json(data=data, path="x")
+    assert value == expected_value, ASSERT_FAIL_MESSAGE.format(output=value, expected_output=expected_value)
+
+    expected_value = 0.75
+    value = extract_data_from_json(data=data, path="y")
+    assert value == expected_value, ASSERT_FAIL_MESSAGE.format(output=value, expected_output=expected_value)