diff --git a/app.js b/app.js
index 5fca775..0786f70 100644
--- a/app.js
+++ b/app.js
@@ -72,7 +72,11 @@ document.querySelector("#btc-qr-link a").addEventListener("click", function(){
             document.querySelector("#doge-js-qr").remove();
 	}
         // Display BTC QR code
+        if (document.contains(document.querySelector("#btc-js-qr"))) {
+            document.querySelector("#btc-js-qr").remove();
+	} else {
 	document.querySelector("#btcwall").insertAdjacentHTML("afterend", "<span class=\"crypto-js-qr\" id=\"btc-js-qr\"><img src=\"images/crypto/btc-qr.png\"></span>");
+	}
 });
 
 // Watch for click on ETH QR code link
@@ -85,7 +89,11 @@ document.querySelector("#eth-qr-link a").addEventListener("click", function(){
             document.querySelector("#doge-js-qr").remove();
 	}
         // Display ETH QR code
+        if (document.contains(document.querySelector("#eth-js-qr"))) {
+            document.querySelector("#eth-js-qr").remove();
+	} else {
 	document.querySelector("#ethwall").insertAdjacentHTML("afterend", "<span class=\"crypto-js-qr\" id=\"eth-js-qr\"><img src=\"images/crypto/eth-qr.png\"></span>");
+	}
 });
 
 // Watch for click on DOGE QR code link
@@ -98,5 +106,9 @@ document.querySelector("#doge-qr-link a").addEventListener("click", function(){
             document.querySelector("#eth-js-qr").remove();
 	}
         // Display DOGE QR code
+        if (document.contains(document.querySelector("#doge-js-qr"))) {
+            document.querySelector("#doge-js-qr").remove();
+	} else {
 	document.querySelector("#dogewall").insertAdjacentHTML("afterend", "<span class=\"crypto-js-qr\" id=\"doge-js-qr\"><img src=\"images/crypto/doge-qr.png\"></span>");
+	}
 });