From 6045bd4eb5b709f81259ae3ef34f0076ae627112 Mon Sep 17 00:00:00 2001
From: Sam Harwell <sam@tunnelvisionlabs.com>
Date: Wed, 18 Jul 2012 15:42:38 -0500
Subject: [PATCH] Add null check

---
 tool/src/org/antlr/v4/semantics/SymbolChecks.java | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tool/src/org/antlr/v4/semantics/SymbolChecks.java b/tool/src/org/antlr/v4/semantics/SymbolChecks.java
index d3e8cdd5f..75d068f38 100644
--- a/tool/src/org/antlr/v4/semantics/SymbolChecks.java
+++ b/tool/src/org/antlr/v4/semantics/SymbolChecks.java
@@ -280,7 +280,7 @@ public class SymbolChecks {
 										  g.fileName, ref.token, ruleName);
 			}
 			GrammarAST arg = (GrammarAST)ref.getChild(0);
-			if ( arg!=null && r.args==null ) {
+			if ( arg!=null && (r==null || r.args==null) ) {
 				errMgr.grammarError(ErrorType.RULE_HAS_NO_ARGS,
 										  g.fileName, ref.token, ruleName);