diff --git a/eos/effects/shipbonusforceauxiliaryc1remoteboostandcapamount.py b/eos/effects/shipbonusforceauxiliaryc1remoteboostandcapamount.py
index 144ef28dc..f4d1939eb 100644
--- a/eos/effects/shipbonusforceauxiliaryc1remoteboostandcapamount.py
+++ b/eos/effects/shipbonusforceauxiliaryc1remoteboostandcapamount.py
@@ -7,6 +7,9 @@ type = "passive"
 
 
 def handler(fit, src, context):
+    if src.getModifiedItemAttr("shipBonusForceAuxiliaryC1") is None:
+        return  # See GH Issue 1321
+
     fit.modules.filteredItemBoost(lambda mod: mod.item.requiresSkill("Capacitor Emission Systems") or
                                               mod.item.requiresSkill("Capital Capacitor Emission Systems"),
                                   "powerTransferAmount", src.getModifiedItemAttr("shipBonusForceAuxiliaryC1"),