diff --git a/adminstuds.php b/adminstuds.php
index dc372a6..96efd40 100644
--- a/adminstuds.php
+++ b/adminstuds.php
@@ -176,8 +176,8 @@ if (!empty($_POST['save'])) { // Save edition of an old vote
     $name = $inputService->filterName($_POST['name']);
     $choices = $inputService->filterArray($_POST['choices'], FILTER_VALIDATE_REGEXP, ['options' => ['regexp' => CHOICE_REGEX]]);
 
-    if (empty($name)) {
-        $message = new Message('danger', __('Error', 'The name is invalid'));
+    if ($name == null) {
+        $message = new Message('danger', __('Error', 'The name is invalid.'));
     }
     if (count($choices) != count($_POST['choices'])) {
         $message = new Message('danger', __('Error', 'There is a problem with your choices'));
@@ -234,8 +234,8 @@ if (isset($_POST['add_comment'])) {
     $name = $inputService->filterName($_POST['name']);
     $comment = $inputService->filterComment($_POST['comment']);
 
-    if (empty($name)) {
-        $message = new Message('danger', __('Error', 'The name is invalid'));
+    if ($name == null) {
+        $message = new Message('danger', __('Error', 'The name is invalid.'));
     }
 
     if ($message == null) {
diff --git a/app/classes/Framadate/Services/InputService.php b/app/classes/Framadate/Services/InputService.php
index 848f104..a6c8fae 100644
--- a/app/classes/Framadate/Services/InputService.php
+++ b/app/classes/Framadate/Services/InputService.php
@@ -51,11 +51,13 @@ class InputService {
     }
 
     public function filterTitle($title) {
-        return filter_var($title, FILTER_VALIDATE_REGEXP, ['options' => ['regexp' => TITLE_REGEX]]);
+        $filtered = filter_var($title, FILTER_VALIDATE_REGEXP, ['options' => ['regexp' => TITLE_REGEX]]);
+        return $this->returnIfNotBlank($filtered);
     }
 
     public function filterName($name) {
-        return filter_var($name, FILTER_VALIDATE_REGEXP, ['options' => ['regexp' => NAME_REGEX]]);
+        $filtered = filter_var($name, FILTER_VALIDATE_REGEXP, ['options' => ['regexp' => NAME_REGEX]]);
+        return $this->returnIfNotBlank($filtered);
     }
 
     public function filterMail($mail) {
@@ -76,7 +78,22 @@ class InputService {
     }
 
     public function filterComment($comment) {
-        return filter_var($comment, FILTER_SANITIZE_STRING);
+        $filtered = filter_var($comment, FILTER_SANITIZE_STRING);
+        return $this->returnIfNotBlank($filtered);
+    }
+
+    /**
+     * Return the value if it's not blank.
+     *
+     * @param string $filtered The value
+     * @return string|null
+     */
+    private function returnIfNotBlank($filtered) {
+        if ($filtered && !empty(str_replace(' ', '', $filtered))) {
+            return $filtered;
+        } else {
+            return null;
+        }
     }
 
 }
\ No newline at end of file
diff --git a/locale/de.json b/locale/de.json
index 4d3f3a2..eceb45f 100644
--- a/locale/de.json
+++ b/locale/de.json
@@ -119,7 +119,6 @@
         "Votes are editable solely by their owner.": "DE_Les votes sont modifiables uniquement par leur créateur",
         "Save the new rules": "Neue Regeln speichern",
         "Cancel the rules edit": "Neue Regeln nicht speichern",
-        "The name is invalid.": "Der Name ist ungültig.",
         "Results are hidden.": "DE_Les résultats sont cachés.",
         "Results are visible.": "DE_Les résultats sont visibles."
     },
@@ -308,7 +307,7 @@
         "Cookies are disabled on your browser. Theirs activation is required to create a poll.": "Cookies werden auf Ihrem Browser deaktiviert. Deren Aktivierung ist erforderlich, um eine Umfrage zu erstellen.",
         "This poll doesn't exist !": "Diese Umfrage existiert nicht!",
         "Enter a name": "Geben Sie einen Namen ein",
-        "Name is incorrect": "Name ist falsch",
+        "The name is invalid.": "Der Name ist ungültig.",
         "The name you've chosen already exist in this poll!": "Der von Ihnen eingegebenen Name existiert bereits in dieser Umfrage",
         "Enter a name and a comment!": "Geben Sie einen Namen und ein Kommentar ein!",
         "Failed to insert the comment!": "Einfügen des Kommentars gescheitert!",
diff --git a/locale/en.json b/locale/en.json
index c736ec9..34b76f9 100644
--- a/locale/en.json
+++ b/locale/en.json
@@ -119,7 +119,6 @@
     "Votes are editable solely by their owner.": "Votes are editable solely by their owner",
     "Save the new rules": "Save the new rules",
     "Cancel the rules edit": "Cancel the rules edit",
-    "The name is invalid.": "The name is invalid.",
     "Results are hidden.": "Results are hidden.",
     "Results are visible.": "Results are visible."
   },
@@ -308,7 +307,7 @@
     "Cookies are disabled on your browser. Theirs activation is required to create a poll.": "Cookies are disabled on your browser. Theirs activation is required to create a poll.",
     "This poll doesn't exist !": "This poll doesn't exist !",
     "Enter a name": "Enter a name",
-    "Name is incorrect": "Name is incorrect",
+    "The name is invalid.": "The name is invalid.",
     "The name you've chosen already exist in this poll!": "The name you've chosen already exist in this poll!",
     "Enter a name and a comment!": "Enter a name and a comment!",
     "Failed to insert the comment!": "Failed to insert the comment!",
diff --git a/locale/es.json b/locale/es.json
index 84189b6..df9febf 100644
--- a/locale/es.json
+++ b/locale/es.json
@@ -119,7 +119,6 @@
         "Votes are editable solely by their owner.": "ES_Les votes sont modifiables uniquement par leur créateur",
         "Save the new rules": "ES_Enregistrer les nouvelles permissions",
         "Cancel the rules edit": "ES_Annuler le changement de permissions",
-        "The name is invalid.": "ES_Le nom n'est pas valide.",
         "Results are hidden.": "ES_Les résultats sont cachés.",
         "Results are visible.": "ES_Les résultats sont visibles."
     },
@@ -308,7 +307,7 @@
         "Cookies are disabled on your browser. Theirs activation is required to create a poll.": "ES_Les cookies sont désactivés sur votre navigateur. Leur activation est requise pour la création d'un sondage.",
         "This poll doesn't exist !": "Este encuesta no existe!",
         "Enter a name": "Introduzca un nombre",
-        "Name is incorrect": "ES_Le nom est pas correct",
+        "The name is invalid.": "ES_Le nom n'est pas valide.",
         "The name you've chosen already exist in this poll!": "El nombre entrado existe ya!",
         "Enter a name and a comment!": "Introduzca su nombre y un comentario!",
         "Failed to insert the comment!": "ES_Échec à l'insertion du commentaire !",
diff --git a/locale/fr.json b/locale/fr.json
index eef8aea..f60c445 100644
--- a/locale/fr.json
+++ b/locale/fr.json
@@ -119,7 +119,6 @@
     "Votes are editable solely by their owner.": "Les votes sont modifiables uniquement par leur créateur",
     "Save the new rules": "Enregistrer les nouvelles permissions",
     "Cancel the rules edit": "Annuler le changement de permissions",
-    "The name is invalid.": "Le nom n'est pas valide.",
     "Results are hidden.": "Les résultats sont cachés.",
     "Results are visible.": "Les résultats sont visibles."
   },
@@ -308,7 +307,7 @@
     "Cookies are disabled on your browser. Theirs activation is required to create a poll.": "Les cookies sont désactivés sur votre navigateur. Leur activation est requise pour la création d'un sondage.",
     "This poll doesn't exist !": "Ce sondage n'existe pas !",
     "Enter a name": "Vous n'avez pas saisi de nom !",
-    "Name is incorrect": "Le nom est pas correct",
+    "The name is invalid.": "Le nom n'est pas valide.",
     "The name you've chosen already exist in this poll!": "Le nom que vous avez choisi existe déjà !",
     "Enter a name and a comment!": "Merci de remplir les deux champs !",
     "Failed to insert the comment!": "Échec à l'insertion du commentaire !",
diff --git a/studs.php b/studs.php
index aa0b25b..ed3466a 100644
--- a/studs.php
+++ b/studs.php
@@ -149,8 +149,8 @@ if (!empty($_POST['save'])) { // Save edition of an old vote
     $name = $inputService->filterName($_POST['name']);
     $choices = $inputService->filterArray($_POST['choices'], FILTER_VALIDATE_REGEXP, ['options' => ['regexp' => CHOICE_REGEX]]);
 
-    if (empty($name)) {
-        $message = new Message('danger', __('Error', 'Name is incorrect'));
+    if ($name == null) {
+        $message = new Message('danger', __('Error', 'The name is invalid.'));
     }
     if (count($choices) != count($_POST['choices'])) {
         $message = new Message('danger', __('There is a problem with your choices'));
@@ -181,8 +181,8 @@ if (isset($_POST['add_comment'])) {
     $name = $inputService->filterName($_POST['name']);
     $comment = $inputService->filterComment($_POST['comment']);
 
-    if (empty($name)) {
-        $message = new Message('danger', __('Error', 'Name is incorrect'));
+    if ($name == null) {
+        $message = new Message('danger', __('Error', 'The name is invalid.'));
     }
 
     if ($message == null) {
diff --git a/tpl/studs.tpl b/tpl/studs.tpl
index e553fd4..4a9828f 100644
--- a/tpl/studs.tpl
+++ b/tpl/studs.tpl
@@ -12,7 +12,7 @@
             <div class="alert alert-dismissible alert-{$message->type|html}" role="alert">{$message->message|html}{if $message->link != null}<br/><a href="{$message->link}">{$message->link}</a>{/if}<button type="button" class="close" data-dismiss="alert" aria-label="Close"><span aria-hidden="true">&times;</span></button></div>
         {/if}
     </div>
-    <div id="nameErrorMessage" class="hidden alert alert-dismissible alert-danger" role="alert">{__('PollInfo', 'The name is invalid.')}<button type="button" class="close" data-dismiss="alert" aria-label="Close"><span aria-hidden="true">&times;</span></button></div>
+    <div id="nameErrorMessage" class="hidden alert alert-dismissible alert-danger" role="alert">{__('Error', 'The name is invalid.')}<button type="button" class="close" data-dismiss="alert" aria-label="Close"><span aria-hidden="true">&times;</span></button></div>
 
 
     {* Global informations about the current poll *}