diff --git a/actions-workflow-parser/src/model/converter/cron.test.ts b/actions-workflow-parser/src/model/converter/cron.test.ts
index 9454c83..6f525ec 100644
--- a/actions-workflow-parser/src/model/converter/cron.test.ts
+++ b/actions-workflow-parser/src/model/converter/cron.test.ts
@@ -18,7 +18,6 @@ describe("isValidCron", () => {
     "0 0 * * SUN",
     "0 0 * * SUN-TUE",
     "0 0 * * SUN-2",
-    "0 * * */FEB */TUE",
     "0 2-4/5 * * *",
   ]
 
@@ -40,6 +39,7 @@ describe("isValidCron", () => {
     "0 5--5 * * *",
     "0 *//5 * * *",
     "0 ,, * * *",
+    "0 , , , ,",
     "0 ** * * *",
     "0 0 * * BUN",
     "0 0 * SUN JAN",
@@ -49,6 +49,7 @@ describe("isValidCron", () => {
     "0 2/4-5 * * *",
     "0 2-4-6 * * *",
     "0 2/4/6 * * *",
+    "0 * * */FEB */TUE",
   ]
 
   for (const cron of invalid) {
diff --git a/actions-workflow-parser/src/model/converter/cron.ts b/actions-workflow-parser/src/model/converter/cron.ts
index 911494d..1e65280 100644
--- a/actions-workflow-parser/src/model/converter/cron.ts
+++ b/actions-workflow-parser/src/model/converter/cron.ts
@@ -76,8 +76,8 @@ function validateRange(
     }
 
     const [start, step, ...rest] = value.split("/")
-    const stepNumber = convertToNumber(range, step)
-    if (rest.length > 0 || stepNumber <= 0 || !start || !step) {
+    const stepNumber = +step
+    if (rest.length > 0 || isNaN(stepNumber) || stepNumber <= 0 || !start || !step) {
       return false
     }