1 files changed, 8 insertions, 3 deletions
diff --git a/lib/handlebars/compiler/ast.js b/lib/handlebars/compiler/ast.js
index e8cde74..64cd3b7 100644
--- a/lib/handlebars/compiler/ast.js
+++ b/lib/handlebars/compiler/ast.js
@@ -19,9 +19,14 @@ var AST = {
     this.hash = hash;
     this.strip = strip;
 
-    // Must use charAt to support IE pre-10
-    var escapeFlag = open.charAt(3) || open.charAt(2);
-    this.escaped = escapeFlag !== '{' && escapeFlag !== '&';
+    // Open may be a string parsed from the parser or a passed boolean flag
+    if (open != null && open.charAt) {
+      // Must use charAt to support IE pre-10
+      var escapeFlag = open.charAt(3) || open.charAt(2);
+      this.escaped = escapeFlag !== '{' && escapeFlag !== '&';
+    } else {
+      this.escaped = !!open;
+    }
 
     var id = this.id = rawParams[0];
     var params = this.params = rawParams.slice(1);