diff --git a/common/content/events.js b/common/content/events.js
index 3b93df55..479898d7 100644
--- a/common/content/events.js
+++ b/common/content/events.js
@@ -992,7 +992,8 @@ var Events = Module("events", {
         */
 
         input: function onInput(event) {
-            delete event.originalTarget.dactylKeyPress;
+            if (event.originalTarget.dactylKeyPress)
+                delete event.originalTarget.dactylKeyPress;
         },
 
         // this keypress handler gets always called first, even if e.g.