* add check for missing actiontracker

Author: giannis

plugins-client/ext.save/save.js

@@ -95,7 +95,7 @@ module.exports = ext.register("ext/save/save", {
                 if (node.getAttribute("deleted"))
                     return;
 
-                if (node && (at.undo_ptr && at.$undostack[at.$undostack.length-1] !== at.undo_ptr
+                if (node && (at && at.undo_ptr && at.$undostack[at.$undostack.length-1] !== at.undo_ptr
                   || !at.undo_ptr && node.getAttribute("changed") == 1)
                   && (!node.getAttribute("newfile") || e.page.$doc.getValue())) {
                     ext.initExtension(_self);