From ab39ad4dc4954d2a8b472df6879675e30c7e04fa Mon Sep 17 00:00:00 2001
From: Pierre Cavin <me@sherlox.io>
Date: Mon, 23 Oct 2023 16:28:31 +0200
Subject: [PATCH] fix: prevent infinite loop if step is two or more zeros

---
 src/time.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/time.ts b/src/time.ts
index 126698a1..81239a08 100644
--- a/src/time.ts
+++ b/src/time.ts
@@ -774,10 +774,10 @@ export class CronTime {
 				let upper = mUpper !== undefined ? parseInt(mUpper, 10) : undefined;
 
 				const wasStepDefined = mStep !== undefined;
-				if (mStep === '0') {
+				const step = parseInt(mStep ?? '1', 10);
+				if (step === 0) {
 					throw new Error(`Field (${unit}) has a step of zero`);
 				}
-				const step = parseInt(mStep ?? '1', 10);
 
 				if (upper !== undefined && lower > upper) {
 					throw new Error(`Field (${unit}) has an invalid range`);