diff --git a/app/library/HttpAPI.py b/app/library/HttpAPI.py
index f922e84a..b97c8dd1 100644
--- a/app/library/HttpAPI.py
+++ b/app/library/HttpAPI.py
@@ -1007,9 +1007,6 @@ class HttpAPI(Common):
             if not item.get("id", None) or not validate_uuid(item.get("id"), version=4):
                 item["id"] = str(uuid.uuid4())
 
-            if not item.get("timer", None) or str(item.get("timer")).strip() == "":
-                item["timer"] = f"{random.randint(1,59)} */1 * * *"  # noqa: S311
-
             if not item.get("template", None):
                 item["template"] = ""
 
diff --git a/app/library/Tasks.py b/app/library/Tasks.py
index ed3a448e..e529a54f 100644
--- a/app/library/Tasks.py
+++ b/app/library/Tasks.py
@@ -108,7 +108,7 @@ class Tasks(metaclass=Singleton):
         self.load()
         self._notify.subscribe(
             Events.TASKS_ADD,
-            lambda data, _, **kwargs: self.add(**data.data),  # noqa: ARG005
+            lambda data, _, **kwargs: self.save(**data.data),  # noqa: ARG005
             f"{__class__.__name__}.add",
         )
 
@@ -145,6 +145,7 @@ class Tasks(metaclass=Singleton):
         for i, task in enumerate(tasks):
             try:
                 task, task_status = clean_item(task, keys=("cookies", "config"))
+                self.validate(task)
                 task = Task(**task)
                 if task_status:
                     need_save = True
@@ -152,9 +153,13 @@ class Tasks(metaclass=Singleton):
                 LOG.error(f"Failed to parse task at list position '{i}'. '{e!s}'.")
                 continue
 
+            self._tasks.append(task)
+
+            if not task.timer:
+                continue
+
             try:
                 self._scheduler.add(timer=task.timer, func=self._runner, args=(task,), id=task.id)
-                self._tasks.append(task)
 
                 try:
                     from cronsim import CronSim
@@ -221,14 +226,19 @@ class Tasks(metaclass=Singleton):
             msg = "No name found."
             raise ValueError(msg)
 
-        if not task.get("timer"):
-            msg = "No timer found."
-            raise ValueError(msg)
-
         if not task.get("url"):
             msg = "No URL found."
             raise ValueError(msg)
 
+        if task.get("timer"):
+            try:
+                from cronsim import CronSim
+
+                CronSim(task.get("timer"), datetime.now(UTC))
+            except Exception as e:
+                msg = f"Invalid timer format. '{e!s}'."
+                raise ValueError(msg) from e
+
         if task.get("cli"):
             try:
                 from .Utils import arg_converter
diff --git a/ui/components/TaskForm.vue b/ui/components/TaskForm.vue
index 7f93eac1..fcf0b1ef 100644
--- a/ui/components/TaskForm.vue
+++ b/ui/components/TaskForm.vue
@@ -126,16 +126,15 @@
                     CRON expression timer.
                   </label>
                   <div class="control">
-                    <input type="text" class="input" id="timer" placeholder="leave empty to run once every hour."
-                      v-model="form.timer" :disabled="addInProgress">
+                    <input type="text" class="input" id="timer" v-model="form.timer" :disabled="addInProgress"
+                    placeholder="0 12 * * 5">
                   </div>
                   <span class="help">
                     <span class="icon"><i class="fa-solid fa-info" /></span>
                     <span>
-                      The CRON timer expression to use for this task. If not set, the task will run once an hour in a
-                      random
-                      minute. For more information on CRON expressions, see <NuxtLink to="https://crontab.guru/"
-                        target="_blank">crontab.guru</NuxtLink>.
+                      The CRON timer expression to use for this task. If not set, the task will be disabled. For more
+                      information on CRON expressions, see <NuxtLink to="https://crontab.guru/" target="_blank">
+                        crontab.guru</NuxtLink>.
                     </span>
                   </span>
                 </div>
diff --git a/ui/pages/tasks.vue b/ui/pages/tasks.vue
index 849f3c0f..f56c486f 100644
--- a/ui/pages/tasks.vue
+++ b/ui/pages/tasks.vue
@@ -67,7 +67,8 @@ div.is-centered {
                 <div class="content">
                   <p class="is-text-overflow">
                     <span class="icon"><i class="fa-solid fa-clock" /></span>
-                    <span>{{ tryParse(item.timer) }} - {{ item.timer }}</span>
+                    <span v-if="item.timer">{{ tryParse(item.timer) }} - {{ item.timer }}</span>
+                    <span v-else>No timer is set</span>
                   </p>
                   <p class="is-text-overflow" v-if="item.folder">
                     <span class="icon"><i class="fa-solid fa-folder" /></span>
@@ -102,7 +103,7 @@ div.is-centered {
                 </div>
                 <div class="card-footer-item">
                   <button class="button is-purple is-fullwidth" @click="runNow(item)"
-                    :class="{ 'is-loading': runNowInProgress }">
+                    :class="{ 'is-loading': item?.in_progress }">
                     <span class="icon"><i class="fa-solid fa-up-right-from-square" /></span>
                     <span>Run now</span>
                   </button>
@@ -135,7 +136,6 @@ const toggleForm = ref(false)
 const isLoading = ref(false)
 const initialLoad = ref(true)
 const addInProgress = ref(false)
-const runNowInProgress = ref(false)
 
 watch(() => config.app.basic_mode, async () => {
   if (!config.app.basic_mode) {
@@ -241,6 +241,7 @@ const deleteItem = async item => {
 }
 
 const updateItem = async ({ reference, task }) => {
+  task = cleanObject(task, ['in_progress'])
   if (reference) {
     // -- find the task index.
     const index = tasks.value.findIndex((t) => t?.id === reference)
@@ -297,7 +298,7 @@ const runNow = async item => {
     return
   }
 
-  runNowInProgress.value = true
+  item.in_progress = true
 
   let data = {
     url: item.url,
@@ -320,7 +321,7 @@ const runNow = async item => {
 
   setTimeout(async () => {
     await nextTick()
-    runNowInProgress.value = false
+    item.in_progress = false
   }, 500)
 }
 
@@ -360,4 +361,5 @@ const exportItem = async item => {
   return copyText(base64UrlEncode(JSON.stringify(data)));
 }
 
+
 </script>
diff --git a/ui/utils/index.js b/ui/utils/index.js
index 74639fcb..8bf347ea 100644
--- a/ui/utils/index.js
+++ b/ui/utils/index.js
@@ -476,6 +476,22 @@ const toggleClass = (target, className) => {
   target.classList.add(className)
 }
 
+const cleanObject = (item, fields = []) => {
+  if (!item || typeof item !== 'object' || fields.length < 1) {
+    return item
+  }
+
+  const cleaned = {}
+
+  for (const key of Object.keys(item)) {
+    if (false === fields.includes(key)) {
+      cleaned[key] = item[key]
+    }
+  }
+
+  return cleaned
+}
+
 export {
   ag_set,
   ag,
@@ -502,4 +518,5 @@ export {
   base64UrlDecode,
   has_data,
   toggleClass,
+  cleanObject,
 }