diff --git a/admin/insert.php b/admin/insert.php
index f6f836f..4301bdd 100644
--- a/admin/insert.php
+++ b/admin/insert.php
@@ -17,6 +17,8 @@
 		$template = "INSERT INTO `".$dbname."` (`id`, `nom`, `curs`, `grau`, `quimata`, `requested`, `mort`, `password`)" .
 					" VALUES (NULL, '".$user[0]."', '".$user[1]."', '".$user[2]."', ".$i.", '0', '0', '')";
 
-		if (query($template)) header("Location: ./index.php");
+		if (!query($template)) die("An error ocurred.");
 	}
+	
+	header("Location: ./index.php");
 ?>
diff --git a/index.php b/index.php
index 9ef86fe..3e29c26 100644
--- a/index.php
+++ b/index.php
@@ -55,7 +55,7 @@
 				console.log(users);
 				autocomplete(document.getElementById("search-input"), users, "search");
 			
-				userid = <?=isset($_COOKIE['user']) ? $_COOKIE['user'] : -1 ?>;
+				userid = <?=isset($_COOKIE['user']) ? (int)$_COOKIE['user'] : -1 ?>;
 				username = $('option[value=' + userid + ']').text();
 		
 				if (userid > 0) {
diff --git a/main.php b/main.php
index 6228fbf..7e0231b 100644
--- a/main.php
+++ b/main.php
@@ -41,14 +41,14 @@
 
 		<script>
 			let user = {
-				'id': <?=$user->id?>,
-				'quimata': <?=$user->quimata?>,
-				'requested': <?=$user->requested?>,
-				'mort': <?=$user->mort?>,
+				'id': <?=(int)$user->id?>,
+				'quimata': <?=(int)$user->quimata?>,
+				'requested': <?=(int)$user->requested?>,
+				'mort': <?=(int)$user->mort?>,
 
 				'nom': "<?=$user->nomcomplet?>",
-				'curs': <?=$user->curs?>,
-				'grau': <?=$user->grau?>
+				'curs': <?=(int)$user->curs?>,
+				'grau': <?=(int)$user->grau?>
 			};
 		</script>
 
@@ -61,7 +61,7 @@
 				<div class="formulari_contrasenya" style="display: none;">
 					<p>Sembla que no tens clau d'accés, la gent podrà entrar a la teva compta...</p>
 					<form action="./php/change_password.php" method="POST">
-						<input type="hidden" value="<?=$_COOKIE['user']?>" name="userid">
+						<input type="hidden" value="<?=(int)$_COOKIE['user']?>" name="userid">
 						<input type="password" placeholder="Nova clau d'accés..." name="password" /><br />
 						<input type="password" placeholder="Repeteix la clau d'accés" name="confirmation"/><br />
 						<input type="submit">
@@ -77,9 +77,9 @@
 							<td>
 								<div id="victim_name"><?=$victim->nomcomplet?></div>
 								<div id="victim_curs_i_grau">
-									<span id="victim_curs"><?=$victim->curs?></span>
+									<span id="victim_curs"><?=(int)$victim->curs?></span>
 									-
-									<span id="victim_grau"><?=$victim->grau?></span>
+									<span id="victim_grau"><?=(int)$victim->grau?></span>
 								</div>
 								<div id="butons" class="options">
 									<button id="win" onclick="js: send_request(user, 'REQ KILL');">L'he matat</button>
diff --git a/php/utils.php b/php/utils.php
index a187aea..6ac2e7e 100644
--- a/php/utils.php
+++ b/php/utils.php
@@ -20,7 +20,7 @@
 		$conn->set_charset("utf8");
 		
 		// Execute query and save result
-		if (!$result = $conn->query($query)) echo $conn->error;
+		$result = $conn->query($query);
 		
 		// Close the connection 
 		$conn->close();