diff --git a/server/gameserver/ability.cc b/server/gameserver/ability.cc
index 0aee0d42..c016bfa2 100644
--- a/server/gameserver/ability.cc
+++ b/server/gameserver/ability.cc
@@ -564,6 +564,9 @@ bool Ability::HasDecAttr(int attr_id)
 
 void Ability::SetSource(AttrHandle handle, int source_type, std::shared_ptr<std::function<std::string()>> cb)
 {
+    if (source_type < kAstNone || source_type >= kAstEnd) {
+        A8_ABORT();
+    }
     auto p = handle.lock();
     p->source_type = source_type;
     p->get_source = cb;