diff --git a/Sonance3-Oblong.wgt b/Sonance3-Oblong.wgt
index 6b1202f..7272fb7 100644
Binary files a/Sonance3-Oblong.wgt and b/Sonance3-Oblong.wgt differ
diff --git a/Sonance3.wgt b/Sonance3.wgt
index 1f6517a..b9d64b9 100644
Binary files a/Sonance3.wgt and b/Sonance3.wgt differ
diff --git a/e2e/helpers/sonance.js b/e2e/helpers/sonance.js
index 42f7fad..0b5081b 100644
--- a/e2e/helpers/sonance.js
+++ b/e2e/helpers/sonance.js
@@ -339,6 +339,9 @@ async function navTo(page, screen) {
 function _pngInPage(page, fn, args) {
     return page.evaluate(async function(a) {
         async function decode(b64) {
+            if (typeof b64 !== 'string' || !/^[A-Za-z0-9+/]+=*$/.test(b64)) {
+                throw new Error('decode: invalid base64 PNG payload');
+            }
             var blob = await (await fetch('data:image/png;base64,' + b64)).blob();
             var bmp = await createImageBitmap(blob);
             var c = document.createElement('canvas');