diff --git a/client/src/inject.ts b/client/src/inject.ts
index 6201188..f574f5d 100644
--- a/client/src/inject.ts
+++ b/client/src/inject.ts
@@ -19,14 +19,15 @@ window.addEventListener('load', () => {
     Utils.consoleLog(inputsWithValue);
     Utils.consoleLog(`trxstate: ${inputsWithValue["trxstate"]}`);
 
-    // "posturl" in function showMap() only available if "pvmapse" PVO code is true.
-    // "pvmapse" false disables seatmap
+    // "posturl" in function showMap() only available if "pvmapse" is true, false disables seatmap
     const posturlAvail: boolean = /posturl:"(.+?)"/.test(content);
-
+    const couponCodeBoxAvail: boolean = !!jQuery("#coupon_code_box").length;
+    
+    Utils.consoleLog(`couponCodeBoxAvail: ${couponCodeBoxAvail}`);
     Utils.consoleLog(`posturl available: ${posturlAvail}`);
 
     // Only inject on page with trxstate 20 and if seatmap is enabled with PVO code "pvmapse"
-    if (inputsWithValue["trxstate"] !== "20" || posturlAvail === false)
+    if (inputsWithValue["trxstate"] !== "20" || posturlAvail === false || couponCodeBoxAvail === true)
         return;
 
     // Inject parent CSS