diff --git a/eos/saveddata/module.py b/eos/saveddata/module.py
index 500ce0977..536be8614 100644
--- a/eos/saveddata/module.py
+++ b/eos/saveddata/module.py
@@ -208,7 +208,8 @@ class Module(HandledItem, HandledCharge, ItemAttrShortcut, ChargeAttrShortcut):
             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)
+                self.__item.group.name not in self.SYSTEM_GROUPS) or \
+               (self.item.isAbyssal and (not self.baseItemID or not self.mutaplasmidID) )
 
     @property
     def isMutated(self):