diff --git a/src/caosadvancedtools/cfood.py b/src/caosadvancedtools/cfood.py
index ada76f4b011778ea07fb99729ca3ac457081ad1d..0074d9a13ca8ab60314b59e2a52496cbacc441f7 100644
--- a/src/caosadvancedtools/cfood.py
+++ b/src/caosadvancedtools/cfood.py
@@ -855,6 +855,9 @@ class CMeal():
     def all_groups_equal(cls, m1, m2):
         equal = True
 
+        if m2 is None:
+            return False
+
         for group in cls.matching_groups:
             if (group not in m1.groupdict() or
                     group not in m2.groupdict() or