Index: src/Parser/parser.yy
===================================================================
--- src/Parser/parser.yy	(revision c84dd616ea09c9d1bd0ef0c0fba904ff70c4d83d)
+++ src/Parser/parser.yy	(revision 923558834ec63344a407046c8e08622d03055144)
@@ -2696,5 +2696,5 @@
 	| ENUM '(' cfa_abstract_parameter_declaration ')' attribute_list_opt identifier attribute_list_opt
 		{
-			if ( $3->storageClasses.any() || $3->type->qualifiers.val != 0 ) {
+			if ( $3 && ($3->storageClasses.any() || $3->type->qualifiers.val != 0 )) {
 				SemanticError( yylloc, "syntax error, storage-class and CV qualifiers are not meaningful for enumeration constants, which are const." );
 			}