diff --git a/build/codemirror_grammar.js b/build/codemirror_grammar.js
index 5f67139..2db1775 100644
--- a/build/codemirror_grammar.js
+++ b/build/codemirror_grammar.js
@@ -2478,6 +2478,25 @@ function empty( state, $id )
     return state;
 }
 
+function stack_clone( stack, deep )
+{
+    if ( null == stack ) return null;
+    if ( deep )
+    {
+        var stack2 = new Stack( stack.val ), ptr2 = stack2, ptr = stack;
+        while( ptr.prev )
+        {
+            ptr2.prev = new Stack( ptr.prev.val );
+            ptr = ptr.prev; ptr2 = ptr2.prev;
+        }
+        return stack2;
+    }
+    else
+    {
+        return stack;
+    }
+}
+
 function err_recover( state, stream, token, tokenizer )
 {
     //var just_space = false;
@@ -3293,7 +3312,7 @@ function State( unique, s )
         self.line = s.line;
         self.bline = s.bline;
         self.status = s.status;
-        self.stack = s.stack/*.slice()*/;
+        self.stack = stack_clone( s.stack, false );
         self.token = s.token;
         self.block = s.block;
         self.outer = s.outer ? [s.outer[0], s.outer[1], new State(unique, s.outer[2])] : null;
diff --git a/build/codemirror_grammar.min.js b/build/codemirror_grammar.min.js
index 1d570cb..9c69668 100644
--- a/build/codemirror_grammar.min.js
+++ b/build/codemirror_grammar.min.js
@@ -7,5 +7,5 @@
 *   https://github.com/foo123/codemirror-grammar
 *   https://github.com/foo123/editor-grammar
 *
-**/!function(e,t,n){"use strict";"object"==typeof module&&module.exports?(module.$deps=module.$deps||{})&&(module.exports=module.$deps[t]=n.call(e)):"function"==typeof define&&define.amd&&"function"==typeof require&&"function"==typeof require.specified&&require.specified(t)?define(t,["module"],function(t){return n.moduleUri=t.uri,n.call(e)}):t in e||(e[t]=n.call(e)||1)&&"function"==typeof define&&define.amd&&define(function(){return e[t]})}(this,"CodeMirrorGrammar",function(){"use strict";function e(e){var t=0;return null===e?t=vt:!0===e||!1===e||e instanceof Boolean?t=Ot:it===e?t=bt:(t=It[ft.call(e)]||yt,t=xt===t||e instanceof Number?isNaN(e)?Ct:isFinite(e)?xt:wt:_t===t||e instanceof String?1===e.length?Lt:_t:Mt===t||e instanceof Array?Mt:qt===t||e instanceof RegExp?qt:Pt===t||e instanceof Date?Pt:Tt===t||e instanceof Function?Tt:Et===t?Et:yt),t}function t(e,t,n,r){var 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diff --git a/editor-grammar b/editor-grammar
index 45d7c19..ad1d812 160000
--- a/editor-grammar
+++ b/editor-grammar
@@ -1 +1 @@
-Subproject commit 45d7c19e021cdf84123b531ffa9675d3323d2e89
+Subproject commit ad1d8123832af71bd20767a1e23e0f1c0dbdc61d