From daf5b1a9aa529e2790278ff339f6f10f9ddd8c40 Mon Sep 17 00:00:00 2001
From: NovaRain <novarain@gmail.com>
Date: Wed, 11 Mar 2020 09:18:39 +0800
Subject: [PATCH] Fixed crash for parser.dll

---
 parse.c    | 12 +++++++-----
 resource.h |  4 ++--
 2 files changed, 9 insertions(+), 7 deletions(-)

diff --git a/parse.c b/parse.c
index cfa0bf7..f7fcb48 100644
--- a/parse.c
+++ b/parse.c
@@ -1139,12 +1139,14 @@ static void term_prime(Procedure *p, NodeList *nodes) {
 		Node *node;
 		//      term(p, nodes);
 		factor(p, nodes);
-		node = &nodes->nodes[nodes->numNodes - 1];
-		if ((i == '/' || i == '%' || i == T_DIV2) && node->token == T_CONSTANT && node->value.type != V_STRING && node->value.intData == 0) {
-			parseSemanticError("Division by zero!");
+		if (nodes->numNodes > 0) { // fix crash for DLL
+			node = &nodes->nodes[nodes->numNodes - 1];
+			if ((i == '/' || i == '%' || i == T_DIV2) && node->token == T_CONSTANT && node->value.type != V_STRING && node->value.intData == 0) {
+				parseSemanticError("Division by zero!");
+			}
+			emitOp(p, nodes, i);
+			term_prime(p, nodes);
 		}
-		emitOp(p, nodes, i);
-		term_prime(p, nodes);
 	}
 	else ungetToken();
 }
diff --git a/resource.h b/resource.h
index 8ea8410..d0515ea 100644
--- a/resource.h
+++ b/resource.h
@@ -6,10 +6,10 @@
 
 #define VERSION_MAJOR 4
 #define VERSION_MINOR 2
-#define VERSION_BUILD 3
+#define VERSION_BUILD 4
 #define VERSION_REV 0
 
-#define VERSION_STRING "4.2.3"
+#define VERSION_STRING "4.2.4"
 
 #ifdef BUILDING_DLL
 #define FILE_STRING "parser.dll"