diff --git a/eos/saveddata/module.py b/eos/saveddata/module.py
index 8189f761e..53f611ddb 100644
--- a/eos/saveddata/module.py
+++ b/eos/saveddata/module.py
@@ -192,14 +192,15 @@ class Module(HandledItem, HandledCharge, ItemAttrShortcut, ChargeAttrShortcut):
         # todo: validate baseItem as well if it's set.
         if self.isEmpty:
             return False
-        return self.__item is None or \
-               (self.__item.category.name not in ("Module", "Subsystem", "Structure Module") and
-                self.__item.group.name not in self.SYSTEM_GROUPS) or \
-               (self.item.isAbyssal and (not self.baseItemID or not self.mutaplasmidID))
+        return (
+            self.__item is None or (
+                self.__item.category.name not in ("Module", "Subsystem", "Structure Module") and
+                self.__item.group.name not in self.SYSTEM_GROUPS) or
+            (self.item.isAbyssal and not self.isMutated))
 
     @property
     def isMutated(self):
-        return self.baseItemID or self.mutaplasmidID
+        return self.baseItemID and self.mutaplasmidID
 
     @property
     def numCharges(self):