diff --git a/lib/ace/edit_session.js b/lib/ace/edit_session.js
index 24a654dd..8f7f1f2b 100644
--- a/lib/ace/edit_session.js
+++ b/lib/ace/edit_session.js
@@ -223,12 +223,12 @@ var EditSession = function(text, mode) {
             this.$screenRowCache = [];
             return;
         }
-
-        var i = this.$getRowCacheIndex(this.$docRowCache, docRow) + 1;
         var l = this.$docRowCache.length;
-        this.$docRowCache.splice(i, l);
-        this.$screenRowCache.splice(i, l);
-
+        var i = this.$getRowCacheIndex(this.$docRowCache, docRow) + 1;
+        if (l > i) {
+            this.$docRowCache.splice(i, l);
+            this.$screenRowCache.splice(i, l);
+        }
     };
 
     this.$getRowCacheIndex = function(cacheArray, val) {