From 75bb6d1e434147f7b227d4d259e5aa44c7d2d1d8 Mon Sep 17 00:00:00 2001
From: Nunuhara Cabbage <nunuhara@haniwa.technology>
Date: Sun, 10 Apr 2022 09:02:30 -0700
Subject: [PATCH] Guard against division by zero in MOD

---
 src/vm.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/vm.c b/src/vm.c
index f1826fc..f73b028 100644
--- a/src/vm.c
+++ b/src/vm.c
@@ -1000,7 +1000,11 @@ static enum opcode execute_instruction(enum opcode opcode)
 		break;
 	}
 	case MOD: {
-		stack[stack_ptr-2].i %= stack[stack_ptr-1].i;
+		if (!stack[stack_ptr-1].i) {
+			stack[stack_ptr-2].i = 0;
+		} else {
+			stack[stack_ptr-2].i %= stack[stack_ptr-1].i;
+		}
 		stack_ptr--;
 		break;
 	}