diff --git a/src/nmreval/math/interpol.py b/src/nmreval/math/interpol.py
index 81a5b31..7d139cd 100644
--- a/src/nmreval/math/interpol.py
+++ b/src/nmreval/math/interpol.py
@@ -24,8 +24,8 @@ def interpolate(data, new_x, xlog=False, ylog=False, kind='cubic', extrapolate=T
         new_y = f(new_x)
 
     if ylog:
-        ret_val.set_data(x=new_x, y=10**new_y, y_err=None)
+        ret_val.set_data(x=new_x, y=10**new_y, y_err=0)
     else:
-        ret_val.set_data(x=new_x, y=new_y, y_err=None)
+        ret_val.set_data(x=new_x, y=new_y, y_err=0)
 
     return ret_val