diff --git a/controllers/EditAlbum.php b/controllers/EditAlbum.php
index 73affff..17710dc 100644
--- a/controllers/EditAlbum.php
+++ b/controllers/EditAlbum.php
@@ -41,13 +41,13 @@ class EditAlbum extends HTMLController
 				exit;
 			}
 			else
-				trigger_error('Cannot delete album: an error occured while processing the request.', E_USER_ERROR);
+				throw new Exception('Cannot delete album: an error occured while processing the request.');
 		}
 		// Editing one, then, surely.
 		else
 		{
 			if ($album->kind !== 'Album')
-				trigger_error('Cannot edit album: not an album.', E_USER_ERROR);
+				throw new Exception('Cannot edit album: not an album.');
 
 			parent::__construct('Edit album \'' . $album->tag . '\'');
 			$form_title = 'Edit album \'' . $album->tag . '\'';
diff --git a/controllers/EditTag.php b/controllers/EditTag.php
index 364a6f4..116d226 100644
--- a/controllers/EditTag.php
+++ b/controllers/EditTag.php
@@ -39,13 +39,13 @@ class EditTag extends HTMLController
 				exit;
 			}
 			else
-				trigger_error('Cannot delete tag: an error occured while processing the request.', E_USER_ERROR);
+				throw new Exception('Cannot delete tag: an error occured while processing the request.');
 		}
 		// Editing one, then, surely.
 		else
 		{
 			if ($tag->kind === 'Album')
-				trigger_error('Cannot edit tag: is actually an album.', E_USER_ERROR);
+				throw new Exception('Cannot edit tag: is actually an album.');
 
 			parent::__construct('Edit tag \'' . $tag->tag . '\'');
 			$form_title = 'Edit tag \'' . $tag->tag . '\'';
diff --git a/controllers/EditUser.php b/controllers/EditUser.php
index cf44235..39715e9 100644
--- a/controllers/EditUser.php
+++ b/controllers/EditUser.php
@@ -33,7 +33,7 @@ class EditUser extends HTMLController
 		{
 			// Don't be stupid.
 			if ($current_user->getUserId() == $id_user)
-				trigger_error('Sorry, I cannot allow you to delete yourself.', E_USER_ERROR);
+				throw new Exception('Sorry, I cannot allow you to delete yourself.');
 
 			// So far so good?
 			$user = Member::fromId($id_user);
@@ -43,7 +43,7 @@ class EditUser extends HTMLController
 				exit;
 			}
 			else
-				trigger_error('Cannot delete user: an error occured while processing the request.', E_USER_ERROR);
+				throw new Exception('Cannot delete user: an error occured while processing the request.');
 		}
 		// Editing one, then, surely.
 		else
diff --git a/models/Database.php b/models/Database.php
index 226cd74..1b1ce21 100644
--- a/models/Database.php
+++ b/models/Database.php
@@ -173,10 +173,10 @@ class Database
 		list ($values, $connection) = $this->db_callback;
 
 		if (!isset($matches[2]))
-			trigger_error('Invalid value inserted or no type specified.', E_USER_ERROR);
+			throw new UnexpectedValueException('Invalid value inserted or no type specified.');
 
 		if (!isset($values[$matches[2]]))
-			trigger_error('The database value you\'re trying to insert does not exist: ' . htmlspecialchars($matches[2]), E_USER_ERROR);
+			throw new UnexpectedValueException('The database value you\'re trying to insert does not exist: ' . htmlspecialchars($matches[2]));
 
 		$replacement = $values[$matches[2]];
 
@@ -184,7 +184,7 @@ class Database
 		{
 			case 'int':
 				if ((!is_numeric($replacement) || (string) $replacement !== (string) (int) $replacement) && $replacement !== 'NULL')
-					trigger_error('Wrong value type sent to the database for field: ' . $matches[2] . '. Integer expected.', E_USER_ERROR);
+					throw new UnexpectedValueException('Wrong value type sent to the database for field: ' . $matches[2] . '. Integer expected.');
 				return $replacement !== 'NULL' ? (string) (int) $replacement : 'NULL';
 			break;
 
@@ -197,12 +197,12 @@ class Database
 				if (is_array($replacement))
 				{
 					if (empty($replacement))
-						trigger_error('Database error, given array of integer values is empty.', E_USER_ERROR);
+						throw new UnexpectedValueException('Database error, given array of integer values is empty.');
 
 					foreach ($replacement as $key => $value)
 					{
 						if (!is_numeric($value) || (string) $value !== (string) (int) $value)
-							trigger_error('Wrong value type sent to the database for field: ' . $matches[2] . '. Array of integers expected.', E_USER_ERROR);
+							throw new UnexpectedValueException('Wrong value type sent to the database for field: ' . $matches[2] . '. Array of integers expected.');
 
 						$replacement[$key] = (string) (int) $value;
 					}
@@ -210,7 +210,7 @@ class Database
 					return implode(', ', $replacement);
 				}
 				else
-					trigger_error('Wrong value type sent to the database for field: ' . $matches[2] . '. Array of integers expected.', E_USER_ERROR);
+					throw new UnexpectedValueException('Wrong value type sent to the database for field: ' . $matches[2] . '. Array of integers expected.');
 
 			break;
 
@@ -218,7 +218,7 @@ class Database
 				if (is_array($replacement))
 				{
 					if (empty($replacement))
-						trigger_error('Database error, given array of string values is empty.', E_USER_ERROR);
+						throw new UnexpectedValueException('Database error, given array of string values is empty.');
 
 					foreach ($replacement as $key => $value)
 						$replacement[$key] = sprintf('\'%1$s\'', mysqli_real_escape_string($connection, $value));
@@ -226,7 +226,7 @@ class Database
 					return implode(', ', $replacement);
 				}
 				else
-					trigger_error('Wrong value type sent to the database for field: ' . $matches[2] . '. Array of strings expected.', E_USER_ERROR);
+					throw new UnexpectedValueException('Wrong value type sent to the database for field: ' . $matches[2] . '. Array of strings expected.');
 			break;
 
 			case 'date':
@@ -235,7 +235,7 @@ class Database
 				elseif ($replacement === 'NULL')
 					return 'NULL';
 				else
-					trigger_error('Wrong value type sent to the database for field: ' . $matches[2] . '. Date expected.', E_USER_ERROR);
+					throw new UnexpectedValueException('Wrong value type sent to the database for field: ' . $matches[2] . '. Date expected.');
 			break;
 
 			case 'datetime':
@@ -246,12 +246,12 @@ class Database
 				elseif ($replacement === 'NULL')
 					return 'NULL';
 				else
-					trigger_error('Wrong value type sent to the database for field: ' . $matches[2] . '. DateTime expected.', E_USER_ERROR);
+					throw new UnexpectedValueException('Wrong value type sent to the database for field: ' . $matches[2] . '. DateTime expected.');
 			break;
 
 			case 'float':
 				if (!is_numeric($replacement) && $replacement !== 'NULL')
-					trigger_error('Wrong value type sent to the database for field: ' . $matches[2] . '. Floating point number expected.', E_USER_ERROR);
+					throw new UnexpectedValueException('Wrong value type sent to the database for field: ' . $matches[2] . '. Floating point number expected.');
 				return $replacement !== 'NULL' ? (string) (float) $replacement : 'NULL';
 			break;
 
@@ -271,7 +271,7 @@ class Database
 			break;
 
 			default:
-				trigger_error('Undefined type <b>' . $matches[1] . '</b> used in the database query', E_USER_ERROR);
+				throw new UnexpectedValueException('Undefined type <b>' . $matches[1] . '</b> used in the database query');
 			break;
 		}
 	}
@@ -289,7 +289,7 @@ class Database
 
 		// Please, just use new style queries.
 		if (strpos($db_string, '\'') !== false && !$security_override)
-			trigger_error('Hack attempt!', 'Illegal character (\') used in query.', E_USER_ERROR);
+			throw new UnexpectedValueException('Hack attempt!', 'Illegal character (\') used in query.');
 
 		if (!$security_override && !empty($db_values))
 		{
@@ -313,7 +313,7 @@ class Database
 		catch (Exception $e)
 		{
 			$clean_sql = implode("\n", array_map('trim', explode("\n", $db_string)));
-			trigger_error($this->error() . '<br>' . $clean_sql, E_USER_ERROR);
+			throw new UnexpectedValueException($this->error() . '<br>' . $clean_sql);
 		}
 
 		return $return;
@@ -327,7 +327,7 @@ class Database
 	{
 		// Please, just use new style queries.
 		if (strpos($db_string, '\'') !== false)
-			trigger_error('Hack attempt!', 'Illegal character (\') used in query.', E_USER_ERROR);
+			throw new UnexpectedValueException('Hack attempt!', 'Illegal character (\') used in query.');
 
 		// Save some values for use in the callback function.
 		$this->db_callback = [$db_values, $this->connection];
diff --git a/models/Registry.php b/models/Registry.php
index 849bd16..3f88bd2 100644
--- a/models/Registry.php
+++ b/models/Registry.php
@@ -24,7 +24,7 @@ class Registry
 	public static function get($key)
 	{
 		if (!isset(self::$storage[$key]))
-			trigger_error('Key does not exist in Registry: ' . $key, E_USER_ERROR);
+			throw new Exception('Key does not exist in Registry: ' . $key);
 
 		return self::$storage[$key];
 	}
@@ -32,7 +32,7 @@ class Registry
 	public static function remove($key)
 	{
 		if (!isset(self::$storage[$key]))
-			trigger_error('Key does not exist in Registry: ' . $key, E_USER_ERROR);
+			throw new Exception('Key does not exist in Registry: ' . $key);
 
 		unset(self::$storage[$key]);
 	}
diff --git a/models/Session.php b/models/Session.php
index d1f6e04..91f7747 100644
--- a/models/Session.php
+++ b/models/Session.php
@@ -33,7 +33,7 @@ class Session
 	public static function getSessionToken()
 	{
 		if (empty($_SESSION['session_token']))
-			trigger_error('Call to getSessionToken without a session token being set!', E_USER_ERROR);
+			throw new Exception('Call to getSessionToken without a session token being set!');
 
 		return $_SESSION['session_token'];
 	}
@@ -41,7 +41,7 @@ class Session
 	public static function getSessionTokenKey()
 	{
 		if (empty($_SESSION['session_token_key']))
-			trigger_error('Call to getSessionTokenKey without a session token key being set!', E_USER_ERROR);
+			throw new Exception('Call to getSessionTokenKey without a session token key being set!');
 
 		return $_SESSION['session_token_key'];
 	}
diff --git a/models/Tag.php b/models/Tag.php
index 145db1e..26a04b3 100644
--- a/models/Tag.php
+++ b/models/Tag.php
@@ -276,7 +276,7 @@ class Tag
 			$data);
 
 		if (!$res)
-			trigger_error('Could not create the requested tag.', E_USER_ERROR);
+			throw new Exception('Could not create the requested tag.');
 
 		$data['id_tag'] = $db->insert_id();
 		return $return_format === 'object' ? new Tag($data) : $data;