diff --git a/shapash/utils/utils.py b/shapash/utils/utils.py
index a537b78d..b103b3d7 100644
--- a/shapash/utils/utils.py
+++ b/shapash/utils/utils.py
@@ -73,14 +73,14 @@ def is_nested_list(object_param):
     return any(isinstance(elem, list) for elem in object_param)
 
 
-def add_line_break(text, nbchar, maxlen=150):
+def add_line_break(value, nbchar, maxlen=150):
     """
     adding line break in string if necessary
 
     Parameters
     ----------
-    text : string
-        string to check in order to add line break
+    value : string or oither type
+        if string to check in order to add line break
     nbchar : int
         number of characters before line break
     maxlen : int
@@ -91,10 +91,10 @@ def add_line_break(text, nbchar, maxlen=150):
     string
         original text + line break
     """
-    if isinstance(text, str):
+    if isinstance(value, str):
         length = 0
         tot_length = 0
-        input_word = text.split()
+        input_word = value.split()
         final_sep = []
         for w in input_word[:-1]:
             length = length + len(w)
@@ -113,7 +113,7 @@ def add_line_break(text, nbchar, maxlen=150):
         new_string = "".join(sum(zip(input_word, final_sep + [""]), ())[:-1]) + last_char
         return new_string
     else:
-        return str(text)
+        return value
 
 
 def truncate_str(text, maxlen=40):
diff --git a/tests/unit_tests/explainer/test_smart_plotter.py b/tests/unit_tests/explainer/test_smart_plotter.py
index b3144e8c..0b66d2fb 100644
--- a/tests/unit_tests/explainer/test_smart_plotter.py
+++ b/tests/unit_tests/explainer/test_smart_plotter.py
@@ -1860,11 +1860,11 @@ def test_interactions_plot_3(self):
 
         output = smart_explainer.plot.interactions_plot(col2, col1, violin_maxf=0)
 
-        assert np.array_equal(output.data[0].x, ["34.0"])
+        assert np.array_equal(output.data[0].x, [34.0])
         assert np.array_equal(output.data[0].y, [-1.4])
         assert output.data[0].name == "PhD"
 
-        assert np.array_equal(output.data[1].x, ["27.0"])
+        assert np.array_equal(output.data[1].x, [27.0])
         assert np.array_equal(output.data[1].y, [-0.2])
         assert output.data[1].name == "Master"
 
@@ -1893,7 +1893,7 @@ def test_interactions_plot_4(self):
 
         output = smart_explainer.plot.interactions_plot(col1, col2, violin_maxf=0)
 
-        assert np.array_equal(output.data[0].x, ["520.0", "12800.0"])
+        assert np.array_equal(output.data[0].x, [520, 12800])
         assert np.array_equal(output.data[0].y, [-1.4, -0.2])
         assert np.array_equal(output.data[0].marker.color, [34.0, 27.0])
 
diff --git a/tests/unit_tests/utils/test_utils.py b/tests/unit_tests/utils/test_utils.py
index 0448f4dd..91e5959f 100644
--- a/tests/unit_tests/utils/test_utils.py
+++ b/tests/unit_tests/utils/test_utils.py
@@ -83,7 +83,7 @@ def test_truncate_str_3(self):
 
     def test_add_line_break_1(self):
         t = add_line_break(3453, 10)
-        assert t == "3453"
+        assert t == 3453
 
     def test_add_line_break_2(self):
         t = add_line_break("this is a very long sentence in order to make a very great test", 10)