diff --git a/beakerx/beakerx/plot/plotitem.py b/beakerx/beakerx/plot/plotitem.py
index e7d6b47b83..9a8a10185a 100644
--- a/beakerx/beakerx/plot/plotitem.py
+++ b/beakerx/beakerx/plot/plotitem.py
@@ -159,7 +159,7 @@ def __init__(self, *args, **kwargs):
             defY = getValue(kwargs, 'y')
 
             if defY is not None:
-                if isinstance(defY, pd.Series):
+                if isinstance(defY, pd.Series) or isinstance(defY, np.ndarray):
                     defY = defY.tolist()
                 defX = list(range(0, len(defY)))
             else: