diff --git a/src/tab.js b/src/tab.js
index 5d58ea5..86405d3 100644
--- a/src/tab.js
+++ b/src/tab.js
@@ -141,9 +141,12 @@ SideTab.prototype = {
     const imgTest = document.createElement("img");
     imgTest.src = favIconUrl;
     imgTest.onerror = () => {
-      this._iconView.style.backgroundImage = "";
+      this.resetIcon();
     };
   },
+  resetIcon() {
+    this._iconView.style.backgroundImage = "";
+  },
   setLoading(isLoading) {
     toggleClass(this.view, "loading", isLoading);
     if (isLoading) {
diff --git a/src/tablist.js b/src/tablist.js
index ffa8a1a..60e759d 100644
--- a/src/tablist.js
+++ b/src/tablist.js
@@ -648,7 +648,11 @@ SideTabList.prototype = {
   setIcon(tab) {
     let sidetab = this.getTab(tab);
     if (sidetab) {
-      sidetab.updateIcon(tab.favIconUrl);
+      if (tab.favIconUrl) {
+        sidetab.updateIcon(tab.favIconUrl);
+      } else {
+        sidetab.resetIcon();
+      }
     }
   },
   setLoading(tab, isLoading) {