diff --git a/src/js/tab.js b/src/js/tab.js
index 3f70aec0e..ebdce0c42 100644
--- a/src/js/tab.js
+++ b/src/js/tab.js
@@ -343,7 +343,7 @@
                 fctxt.setURL(targetURL)
                      .setTabId(openerTabId)
                      .setTabOriginFromURL(rootOpenerURL)
-                     .setDocOriginFromURL(localOpenerURL);
+                     .setDocOriginFromURL(localOpenerURL || rootOpenerURL);
             } else {
                 fctxt.setURL(rootOpenerURL)
                      .setTabId(targetTabId)