From 5d687d7d2ca88a535bd6110e4797d310a9511c0e Mon Sep 17 00:00:00 2001
From: Markus Sunela <30700548+makusuko@users.noreply.github.com>
Date: Thu, 2 May 2019 16:35:55 +0300
Subject: [PATCH] Fixed NULL pointer error, if no label is provided after the
 rule keyword.

---
 src/rules.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/rules.c b/src/rules.c
index 7ad038f..fc63a1c 100755
--- a/src/rules.c
+++ b/src/rules.c
@@ -237,7 +237,13 @@ int  ruledata()
    {
       case -1:     err = 201;      /* Unrecognized keyword */
                    break;
-      case r_RULE: Nrules++;
+      case r_RULE: /* Missing the rule label -> set error */
+                   if (parser->Ntokens != 2)
+                   {
+                      err = 201;
+                      break;
+                   }
+                   Nrules++;
                    newrule();
                    RuleState = r_RULE;
                    break;