diff --git a/CHANGELOG.md b/CHANGELOG.md
index 62a73f8c..43c4b274 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,7 @@ This is the rolling changelog for TShock for Terraria. Use past tense when addin
 
 ## TShock 4.5.12
 * Fixed the ability to spawn Zenith projectile with non-original items. (@AgaSpace)
+* Fixed item dupe via /logout & NPC. (@Terrarxxn)
 
 ## TShock 4.5.11
 * Add the new allowed buff TentacleSpike to NPC buff cheat detection bouncer. (@sgkoishi)
diff --git a/TShockAPI/Commands.cs b/TShockAPI/Commands.cs
index 71e10a9d..09d4b253 100644
--- a/TShockAPI/Commands.cs
+++ b/TShockAPI/Commands.cs
@@ -911,6 +911,12 @@ namespace TShockAPI
 				return;
 			}
 
+			if (args.Player.TPlayer.talkNPC != -1)
+			{
+				args.Player.SendErrorMessage("Please close NPC window for logging out.");
+				return;
+			}
+
 			args.Player.Logout();
 			args.Player.SendSuccessMessage("You have been successfully logged out of your account.");
 			if (Main.ServerSideCharacter)