diff --git a/core/src/com/unciv/models/ruleset/validation/UniqueValidator.kt b/core/src/com/unciv/models/ruleset/validation/UniqueValidator.kt
index e7ec5bb2ee..db63394997 100644
--- a/core/src/com/unciv/models/ruleset/validation/UniqueValidator.kt
+++ b/core/src/com/unciv/models/ruleset/validation/UniqueValidator.kt
@@ -201,12 +201,17 @@ class UniqueValidator(val ruleset: Ruleset) {
     }
 
     /** Maps uncompliant parameters to their required types */
-    private fun getComplianceErrors(
+    private fun     getComplianceErrors(
         unique: Unique,
     ): List<UniqueComplianceError> {
         if (unique.type == null) return emptyList()
         val errorList = ArrayList<UniqueComplianceError>()
         for ((index, param) in unique.params.withIndex()) {
+            // Trying to catch the error at #11404
+            if (unique.type.parameterTypeMap.size != unique.params.size) {
+                throw Exception("Unique ${unique.text} has ${unique.params.size} parameters, " +
+                        "but its type ${unique.type} only ${unique.type.parameterTypeMap.size} parameters?!")
+            }
             val acceptableParamTypes = unique.type.parameterTypeMap[index]
             val errorTypesForAcceptableParameters =
                 acceptableParamTypes.map { getParamTypeErrorSeverityCached(it, param) }