diff -r a53126b7fe22 -r ee62754b0233 core/moduleapi.lua
--- a/core/moduleapi.lua	Wed Aug 21 00:36:42 2019 +0200
+++ b/core/moduleapi.lua	Wed Aug 21 23:15:05 2019 +0200
@@ -407,7 +407,7 @@
 		if iq_cache:get(cache_key) then
 			reject(errutil.new({
 				type = "modify", condition = "conflict",
-				text = "iq stanza id attribute already used",
+				text = "IQ stanza id attribute already used",
 			}));
 			return;
 		end