diff --git a/eos/saveddata/module.py b/eos/saveddata/module.py
index 1f5e84ec1..6ea98bfec 100644
--- a/eos/saveddata/module.py
+++ b/eos/saveddata/module.py
@@ -416,10 +416,10 @@ class Module(HandledItem, HandledCharge, ItemAttrShortcut, ChargeAttrShortcut):
         # Check this only if we're told to do so
         if hardpointLimit:
             if self.hardpoint == Hardpoint.TURRET:
-                if fit.ship.getModifiedItemAttr('turretSlotsLeft') - fit.getHardpointsUsed(Hardpoint.TURRET) < 1:
+                if (fit.ship.getModifiedItemAttr('turretSlotsLeft') or 0) - fit.getHardpointsUsed(Hardpoint.TURRET) < 1:
                     return False
             elif self.hardpoint == Hardpoint.MISSILE:
-                if fit.ship.getModifiedItemAttr('launcherSlotsLeft') - fit.getHardpointsUsed(Hardpoint.MISSILE) < 1:
+                if (fit.ship.getModifiedItemAttr('launcherSlotsLeft')or 0) - fit.getHardpointsUsed(Hardpoint.MISSILE) < 1:
                     return False
 
         return True