diff --git a/node_modules/ace/lib/ace/edit_session.js b/node_modules/ace/lib/ace/edit_session.js
index 263592d8..32db04b9 100644
--- a/node_modules/ace/lib/ace/edit_session.js
+++ b/node_modules/ace/lib/ace/edit_session.js
@@ -1195,19 +1195,23 @@ EditSession.$uid = 0;
             return isUndo ? delta.action !== "insert" : delta.action === "insert";
         }
 
-        var delta = deltas[0];
         var range, point;
-        var lastDeltaIsInsert = false;
-        if (isInsert(delta)) {
-            range = Range.fromPoints(delta.start, delta.end);
-            lastDeltaIsInsert = true;
-        } else {
-            range = Range.fromPoints(delta.start, delta.start);
-            lastDeltaIsInsert = false;
-        }
+        var lastDeltaIsInsert;
 
         for (var i = 1; i < deltas.length; i++) {
-            delta = deltas[i];
+            var delta = deltas[i];
+            if (!delta.start) continue; // skip folds
+            if (!range) {
+                if (isInsert(delta)) {
+                    range = Range.fromPoints(delta.start, delta.end);
+                    lastDeltaIsInsert = true;
+                } else {
+                    range = Range.fromPoints(delta.start, delta.start);
+                    lastDeltaIsInsert = false;
+                }
+                continue;
+            }
+            
             if (isInsert(delta)) {
                 point = delta.start;
                 if (range.compare(point.row, point.column) == -1) {