diff --git a/static/sfu.js b/static/sfu.js
index 8e932bf..e6b73d0 100644
--- a/static/sfu.js
+++ b/static/sfu.js
@@ -217,6 +217,8 @@ async function setLocalMedia() {
             stream = await navigator.mediaDevices.getUserMedia(constraints);
         } catch(e) {
             console.error(e);
+            document.getElementById('presenterbox').checked = false;
+            await setLocalMedia();
             return;
         }
         localMediaId = await newUpStream();
@@ -259,6 +261,8 @@ async function setShareMedia() {
             stream = await navigator.mediaDevices.getDisplayMedia({});
         } catch(e) {
             console.error(e);
+            document.getElementById('sharebox').checked = false;
+            await setShareMedia();
             return;
         }
         shareMediaId = await newUpStream();