diff --git a/README.md b/README.md
index 6e51b45..ba1ae61 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-<img src="https://raw.githubusercontent.com/MelonCTech/Meproc/master/docs/logo.png" style="width:500px;" />
+<img src="https://raw.githubusercontent.com/MelonCTech/Meproc/master/docs/logo.png" />
 
 
 <br>
@@ -17,6 +17,10 @@ Features:
 - The project only needs to pre-install the Melang interpreter, and no more others need to be installed.
 
 
+## Web UI Screenshot
+
+<img src="https://raw.githubusercontent.com/MelonCTech/Meproc/master/docs/webui.png" />
+
 
 ## Installation
 
diff --git a/controllers/proc.m b/controllers/proc.m
index 84e3721..6ad11c2 100644
--- a/controllers/proc.m
+++ b/controllers/proc.m
@@ -110,6 +110,10 @@
             R['code'] = 400;
             return J.encode(['code': 400, 'msg': 'Invalid JSON field']);
         } fi
+        if (S.int(body['interval']) <= 0) {
+            R['code'] = 400;
+            return J.encode(['code': 400, 'msg': "Interval must be a positive integer'"]);
+        } fi
         if (S.int(body['replica']) <= 0) {
             R['code'] = 400;
             return J.encode(['code': 400, 'msg': "Replica must be a positive integer'"]);
diff --git a/coroutines/http.m b/coroutines/http.m
index eec00bc..050813a 100644
--- a/coroutines/http.m
+++ b/coroutines/http.m
@@ -5,10 +5,29 @@
 mq = Import('mq');
 http = Import('http');
 str = Import('str');
+json = Import('json');
 
 while (1) {
     data = mq.recv('http', 1000);
-    !sys.is_nil(data) && Tasks[data] && --(Tasks[data]['running']);
+    if (!sys.is_nil(data)) {
+        d = json.decode(data);
+        conf = d['conf'];
+        name = conf['name'];
+        if (Tasks[name]['type'] == 'daemon') {
+            msg = "Daemon Task " + name + " (" + d['alias'];
+            if (conf['user'] || conf['group']) {
+                msg += " running as ";
+                conf['user'] && (msg += conf['user']);
+                msg += ':';
+                conf['group'] && (msg += conf['group']);
+            } fi
+            msg += ") start";
+            Log('info', msg);
+            Eval('@/../coroutines/task.m', data, false, d['alias']);
+        } else {
+            Tasks[name] && --(Tasks[name]['running']);
+        }
+    } fi
 
     cron_job_process();
 
diff --git a/coroutines/task.m b/coroutines/task.m
index 9c124ee..4d012bf 100644
--- a/coroutines/task.m
+++ b/coroutines/task.m
@@ -11,7 +11,9 @@
 cmd = conf['cmd'];
 interval = conf['interval'];
 
-again:
+if (type == 'daemon') {
+    s.msleep(interval);
+} fi
 
 s.exec(cmd, -1, pid, conf['user'], conf['group'], alias);
 
@@ -25,9 +27,5 @@
 msg += ") exit";
 Log('info', msg);
 
-if (type == 'daemon') {
-    s.msleep(interval);
-    goto again;
-} fi
 
-m.send('http', conf['name']);
+m.send('http', EVAL_DATA);
diff --git a/docs/webui.png b/docs/webui.png
new file mode 100644
index 0000000..b35a08d
Binary files /dev/null and b/docs/webui.png differ
diff --git a/meproc.m b/meproc.m
index e3d4406..43f6a1e 100644
--- a/meproc.m
+++ b/meproc.m
@@ -10,7 +10,7 @@
     return;
 } fi
 
-Log('info', "Meproc v1.0.4. Listen on: " + Conf['ip'] + ':' + Conf['port']);
+Log('info', "Meproc v1.0.5. Listen on: " + Conf['ip'] + ':' + Conf['port']);
 
 Eval('@/coroutines/http.m');
 Eval('@/coroutines/bootstrap.m', nil, false, 'bootstrap');
diff --git a/utils/validator.m b/utils/validator.m
index e1d5953..d441cc1 100644
--- a/utils/validator.m
+++ b/utils/validator.m
@@ -25,7 +25,7 @@
                 continue;
             fi
         } else {
-            if (!sys.has(data, r['field'])) {
+            if (!sys.has(data, r['field']) || ((sys.is_str(data[r['field']]) || sys.is_array(data[r['field']])) && !data[r['field']])) {
                 return false;
             } fi
         }
diff --git a/web/index.html b/web/index.html
index b87c652..d72e3aa 100644
--- a/web/index.html
+++ b/web/index.html
@@ -345,18 +345,18 @@ <h2 style="padding:8px 20px">Start a new task</h2>
       $('#submitbtn').on('click', function(ev) {
         ev.preventDefault();
         $('#tips').css('display', 'none')
-        var type = $('#ttype').val()
+        var type = $('#ttype').val().trim()
         var data = {
-          name: $('#tname').val(),
-          cmd: $('#tcmd').val(),
+          name: $('#tname').val().trim(),
+          cmd: $('#tcmd').val().trim(),
           type: type,
-          replica: parseInt($('#treplica').val()),
+          replica: parseInt($('#treplica').val().trim()),
         }
-        if ($('#tuser').val()) data.user = $('#tuser').val()
-        if ($('#tgrp').val()) data.group = $('#tgrp').val()
+        if ($('#tuser').val()) data.user = $('#tuser').val().trim()
+        if ($('#tgrp').val()) data.group = $('#tgrp').val().trim()
         if ($('#tdep').val()) data.deps = $('#tdep').val()
-        if (type == 'daemon' && $('#tinterval').val()) data.interval = $('#tinterval').val()
-        if (type == 'cron' && $('#tcron').val()) data.cron = $('#tcron').val()
+        if (type == 'daemon' && $('#tinterval').val().trim()) data.interval = $('#tinterval').val().trim()
+        if (type == 'cron' && $('#tcron').val().trim()) data.cron = $('#tcron').val().trim()
         $.ajax({
           url: "http://{{IP}}:{{PORT}}/proc",
           type: "POST",