diff --git a/programs/cardinal-creator-standard/src/instructions/mint_manager/close_mint_manager.rs b/programs/cardinal-creator-standard/src/instructions/mint_manager/close_mint_manager.rs
index 7ce3d6bc..b68dcc46 100644
--- a/programs/cardinal-creator-standard/src/instructions/mint_manager/close_mint_manager.rs
+++ b/programs/cardinal-creator-standard/src/instructions/mint_manager/close_mint_manager.rs
@@ -1,3 +1,4 @@
+use crate::errors::ErrorCode;
 use crate::state::assert_mint_manager_seeds;
 use crate::state::CreatorStandardAccount;
 use crate::state::MintManager;
@@ -69,6 +70,9 @@ impl<'a, 'info> CloseMintManagerCtx<'a, 'info> {
         };
         // deserializations
         let mint_manager: MintManager = MintManager::from_account_info(ctx.mint_manager)?;
+        if mint_manager.in_use_by.is_some() {
+            return Err(ProgramError::from(ErrorCode::TokenCurentlyInUse));
+        }
 
         // mint_manager
         assert_mut(ctx.mint_manager, "mint_manager")?;