diff --git a/lib/ace/ext/language_tools.js b/lib/ace/ext/language_tools.js
index 651835d4..f8c00047 100644
--- a/lib/ace/ext/language_tools.js
+++ b/lib/ace/ext/language_tools.js
@@ -120,40 +120,45 @@ var loadSnippetFile = function(id) {
     });
 };
 
-var doLiveAutocomplete = function(e) {
-    var editor = e.editor;
-    var text = e.args || "";
+function getCompletionPrefix(editor) {
     var pos = editor.getCursorPosition();
     var line = editor.session.getLine(pos.row);
-    var hasCompleter = editor.completer && editor.completer.activated;
     var prefix = util.retrievePrecedingIdentifier(line, pos.column);
-
-    //Try to find custom prefixes on the completers
-    completers.forEach(function(completer) {
+    // Try to find custom prefixes on the completers
+    editor.completers.forEach(function(completer) {
         if (completer.identifierRegexps) {
             completer.identifierRegexps.forEach(function(identifierRegex) {
-                if (!prefix) {
+                if (!prefix && identifierRegex)
                     prefix = util.retrievePrecedingIdentifier(line, pos.column, identifierRegex);
-                }
             });
         }
     });
+    return prefix;
+}
+
+var doLiveAutocomplete = function(e) {
+    var editor = e.editor;
+    var text = e.args || "";
+    var hasCompleter = editor.completer && editor.completer.activated;
+
+
 
     // We don't want to autocomplete with no prefix
-    if (e.command.name === "backspace" && !prefix) {
-        if (hasCompleter)
+    if (e.command.name === "backspace") {
+        if (hasCompleter && !getCompletionPrefix(editor))
             editor.completer.detach();
     }
     else if (e.command.name === "insertstring") {
+        var prefix = getCompletionPrefix(editor);
         // Only autocomplete if there's a prefix that can be matched
         if (prefix && !hasCompleter) {
             if (!editor.completer) {
                 // Create new autocompleter
                 editor.completer = new Autocomplete();
-                // Disable autoInsert
-                editor.completer.autoSelect = false;
-                editor.completer.autoInsert = false;
             }
+            // Disable autoInsert
+            editor.completer.autoSelect = false;
+            editor.completer.autoInsert = false;
             editor.completer.showPopup(editor);
         } else if (!prefix && hasCompleter) {
             // When the prefix is empty
@@ -168,7 +173,8 @@ require("../config").defineOptions(Editor.prototype, "editor", {
     enableBasicAutocompletion: {
         set: function(val) {
             if (val) {
-                this.completers = Array.isArray(val)? val: completers;
+                if (!this.completers)
+                    this.completers = Array.isArray(val)? val: completers;
                 this.commands.addCommand(Autocomplete.startCommand);
             } else {
                 this.commands.removeCommand(Autocomplete.startCommand);
@@ -183,7 +189,8 @@ require("../config").defineOptions(Editor.prototype, "editor", {
     enableLiveAutocompletion: {
         set: function(val) {
             if (val) {
-                this.completers = Array.isArray(val)? val: completers;
+                if (!this.completers)
+                    this.completers = Array.isArray(val)? val: completers;
                 // On each change automatically trigger the autocomplete
                 this.commands.on('afterExec', doLiveAutocomplete);
             } else {