diff --git a/src/playercards/PlayerCardPanel.ttslua b/src/playercards/PlayerCardPanel.ttslua
index a404f8e9..bb4959f3 100644
--- a/src/playercards/PlayerCardPanel.ttslua
+++ b/src/playercards/PlayerCardPanel.ttslua
@@ -800,13 +800,22 @@ function spawnWeaknesses()
 
   prepareToPlaceCards()
 
+  -- exclude custom signature weaknesses
+  local customExcludeList = {}
+  local customInvestigatorData = allCardsBagApi.getCustomInvestigatorData()
+  for investigatorId, invdata in pairs(customInvestigatorData.InvestigatorSubdata or {}) do
+    for _, cardId in ipairs(invdata.signatures or {}) do
+      customExcludeList[cardId] = true
+    end
+  end
+
   local basicWeaknessList = {}
   local otherWeaknessList = {}
   for _, id in ipairs(allCardsBagApi.getUniqueWeaknesses()) do
     local cardMetadata = allCardsBagApi.getCardById(id).metadata
     if cardMetadata.basicWeaknessCount ~= nil and cardMetadata.basicWeaknessCount > 0 then
       table.insert(basicWeaknessList, id)
-    elseif excludedNonBasicWeaknesses[id] == nil then
+    elseif excludedNonBasicWeaknesses[id] == nil and customExcludeList[id] == nil then
       table.insert(otherWeaknessList, id)
     end
   end