From 2e137d4387f2b01eea0b6f19744a19abb182c1b1 Mon Sep 17 00:00:00 2001
From: Jose Rodriguez <boriel@gmail.com>
Date: Sun, 6 Oct 2019 23:40:10 +0200
Subject: [PATCH] Fix crash when referencing undeclared arrays

When declaring a variable or constant referencing an address of an
element of an undeclared array, the compiler crashed. Fixed.
---
 tests/functional/dim_test0.bas | 6 ++++++
 zxbparser.py                   | 3 +++
 2 files changed, 9 insertions(+)
 create mode 100644 tests/functional/dim_test0.bas

diff --git a/tests/functional/dim_test0.bas b/tests/functional/dim_test0.bas
new file mode 100644
index 000000000..ae6b98f24
--- /dev/null
+++ b/tests/functional/dim_test0.bas
@@ -0,0 +1,6 @@
+
+DIM a AT @c(1, 5)
+DIM c(10, 10) as UBYTE
+
+const q = @c(2, 3)
+
diff --git a/zxbparser.py b/zxbparser.py
index a3fdb6814..77a24ef20 100755
--- a/zxbparser.py
+++ b/zxbparser.py
@@ -622,6 +622,9 @@ def p_var_decl_at(p):
     """
     p[0] = None
 
+    if p[2] is None or p[3] is None or p[5] is None:
+        return
+
     if len(p[2]) != 1:
         syntax_error(p.lineno(1),
                      'Only one variable at a time can be declared this way')