diff --git a/module/schools/src/InputFilter/Lab.php b/module/schools/src/InputFilter/Lab.php
index 467adad02be8c32d81ba67f15b1308b1779341f7..0f1b290720a6233835ebc373d03cd3dda1e2eafd 100644
--- a/module/schools/src/InputFilter/Lab.php
+++ b/module/schools/src/InputFilter/Lab.php
@@ -66,7 +66,23 @@ class Lab
                 'randomize' => true,
             ]));
         $attachment->getValidatorChain()
-            ->attach(new Validator\File\UploadFile());
+            ->attach(new Validator\File\UploadFile())
+            ->attach(new Validator\File\MimeType([
+                'application/zip',
+                'application/x-rar-compressed',
+                'application/octet-stream',
+                'application/pdf',
+                'image/png',
+                'image/jpeg',
+                'image/gif',
+                'image/bmp',
+                'image/vnd.microsoft.icon',
+                'image/tiff',
+                'image/tiff',
+                'image/svg+xml',
+                'image/svg+xml',
+                'image/vnd.adobe.photoshop',
+            ]));
 
         $use_ext_program= new Input('use_ext_program');
         $use_ext_program->setRequired(false);
diff --git a/module/schools/src/Service/LabService.php b/module/schools/src/Service/LabService.php
index 56d6ac32250259084a20543bc5fc391eb9cf708b..81b80e453b0fde4fc53b16027315f3d022b93fce 100644
--- a/module/schools/src/Service/LabService.php
+++ b/module/schools/src/Service/LabService.php
@@ -142,7 +142,9 @@ class LabService implements LabServiceInterface
             mkdir($fullPath, 0700, true);
         }
         // remove previous
-        unlink($this->filesPath . '/' . $lab->attachment);
+        if ($lab->attachment) {
+            unlink($this->filesPath . '/' . $lab->attachment);
+        }
         // move new file 
         rename($attachment['tmp_name'], $fullPath . '/' . $attachment['name']);
         $lab->attachment      = $schoolPath . '/' . $attachment['name'];
diff --git a/public/js/utils.js b/public/js/utils.js
index 1ce3beed38928b26171b9df3d9e5870c86d0831a..656f8bbf5431063052e9b921b90d36d715bcaa33 100644
--- a/public/js/utils.js
+++ b/public/js/utils.js
@@ -23,15 +23,21 @@
         render: function (form, messages) {
             var renderMessages = function (element, messages) {
                 var key,
-                    ul;
+                    ul,
+                    inputGrp;
                 element.parents('.form-group').addClass('has-error');
+                inputGrp = element.parents('.input-group');
                 ul = $('<ul class="help-block has-error">');
                 for (key in messages) {
                     if (messages.hasOwnProperty(key)) {
                         ul.append($('<li>').text(messages[key]));
                     }
                 }
-                element.after(ul);
+                if (inputGrp.length > 0) {
+                    inputGrp.after(ul);
+                } else {
+                    element.after(ul);
+                }
             };
             var prop;
             this.clear(form);