--- M6502/Orao.pm	2007/07/31 17:15:54	68
+++ M6502/Orao.pm	2007/07/31 17:34:52	70
@@ -394,7 +394,7 @@
 			$a -= 8;
 			$show_R = 0;
 		} elsif ( $c =~ m/^m/i ) {
-			$a = $v;
+			$a = $v if defined($v);
 			$self->poke_code( $a, @v );
 			printf "poke %d bytes at %04x\n", $#v + 1, $a;
 			$last = '+';