--- a/browser/base/content/contentSearchUI.js
+++ b/browser/base/content/contentSearchUI.js
@@ -241,17 +241,18 @@ ContentSearchUIController.prototype = {
   search(aEvent) {
     if (!this.defaultEngine) {
       return; // Not initialized yet.
     }
 
     let searchText = this.input;
     let searchTerms;
     if (this._table.hidden ||
-        aEvent.originalTarget.id == "contentSearchDefaultEngineHeader" ||
+        (aEvent.originalTarget &&
+          aEvent.originalTarget.id == "contentSearchDefaultEngineHeader") ||
         aEvent instanceof KeyboardEvent) {
       searchTerms = searchText.value;
     } else {
       searchTerms = this.suggestionAtIndex(this.selectedIndex) || searchText.value;
     }
     // Send an event that will perform a search and Firefox Health Report will
     // record that a search from the healthReportKey passed to the constructor.
     let eventData = {