diff --git a/core/logic/smn_adt_trie.cpp b/core/logic/smn_adt_trie.cpp
index 856202a79..ab70f8cc9 100644
--- a/core/logic/smn_adt_trie.cpp
+++ b/core/logic/smn_adt_trie.cpp
@@ -307,7 +307,7 @@ static cell_t SetTrieArray(IPluginContext *pContext, const cell_t *params)
 		return 1;
 	}
 
-	if (!params[4])
+	if (!params[5])
 		return 0;
 
 	i->value.setArray(array, params[4]);