diff --git a/ui/media/js/engine.js b/ui/media/js/engine.js
index 467a45c5..284ddd76 100644
--- a/ui/media/js/engine.js
+++ b/ui/media/js/engine.js
@@ -839,10 +839,13 @@
          * @memberof Task
          */
         async post(timeout=-1) {
-            performance.mark('make-render-request')
-            if (performance.getEntriesByName('click-makeImage', 'mark').length > 0) {
-                console.log('delay between clicking and making the server request:', performance.measure('diff', 'click-makeImage', 'make-render-request').duration + ' ms')
+            if (typeof performance == "object" && performance.mark && performance.measure) {
+                performance.mark('make-render-request')
+                if (performance.getEntriesByName('click-makeImage', 'mark').length > 0) {
+                    console.log('delay between clicking and making the server request:', performance.measure('diff', 'click-makeImage', 'make-render-request').duration + ' ms')
+                }
             }
+
             let jsonResponse = await super.post('/render', timeout)
             if (typeof jsonResponse?.task !== 'number') {
                 console.warn('Endpoint error response: ', jsonResponse)
diff --git a/ui/media/js/main.js b/ui/media/js/main.js
index b518c8c1..4b5c1bc3 100644
--- a/ui/media/js/main.js
+++ b/ui/media/js/main.js
@@ -429,7 +429,10 @@ function getUncompletedTaskEntries() {
 }
 
 function makeImage() {
-    performance.mark('click-makeImage')
+    if (typeof performance == "object" && performance.mark) {
+        performance.mark('click-makeImage')
+    }
+
     if (!SD.isServerAvailable()) {
         alert('The server is not available.')
         return