diff --git a/netbox/utilities/forms/widgets.py b/netbox/utilities/forms/widgets.py
index c27f3c646..429a111b3 100644
--- a/netbox/utilities/forms/widgets.py
+++ b/netbox/utilities/forms/widgets.py
@@ -110,6 +110,13 @@ class SelectSpeedWidget(forms.NumberInput):
 
 class NumericArrayField(SimpleArrayField):
 
+    def clean(self, value):
+        if value and not self.to_python(value):
+            raise forms.ValidationError(f'Invalid list ({value}). '
+                                        f'Must be numeric and ranges must be in ascending order')
+        return super().clean(value)
+
+
     def to_python(self, value):
         if not value:
             return []