diff --git a/lib/core/common.py b/lib/core/common.py
index 3ae3cb531..ef4e69a0a 100644
--- a/lib/core/common.py
+++ b/lib/core/common.py
@@ -2799,7 +2799,7 @@ def intersect(valueA, valueB, lowerCase=False):
     [1, 3]
     """
 
-    retVal = None
+    retVal = []
 
     if valueA and valueB:
         valueA = arrayizeValue(valueA)