diff --git a/src/utils/image-media.ts b/src/utils/image-media.ts
index 1f1db27727..c3320627d0 100644
--- a/src/utils/image-media.ts
+++ b/src/utils/image-media.ts
@@ -92,7 +92,7 @@ export async function createThumbnail(
     context.drawImage(element, 0, 0, targetWidth, targetHeight);
 
     let thumbnailPromise: Promise<Blob>;
-    if (canvas instanceof window.OffscreenCanvas) {
+    if (window.OffscreenCanvas && canvas instanceof window.OffscreenCanvas) {
         thumbnailPromise = canvas.convertToBlob({ type: mimeType });
     } else {
         thumbnailPromise = new Promise<Blob>(resolve => (canvas as HTMLCanvasElement).toBlob(resolve, mimeType));