diff --git a/ext/fg/js/util.js b/ext/fg/js/util.js
index 641b73ac..aeda36b5 100644
--- a/ext/fg/js/util.js
+++ b/ext/fg/js/util.js
@@ -108,6 +108,7 @@ function textSourceFromPoint(point, imposter) {
         return new TextSourceRange(range);
     }
 
+    destroyImposters();
     return null;
 }