diff --git a/src/wp-includes/wp-db.php b/src/wp-includes/wp-db.php
index e5d13bb6a0..d099383b60 100644
--- a/src/wp-includes/wp-db.php
+++ b/src/wp-includes/wp-db.php
@@ -1044,9 +1044,9 @@ class wpdb {
 			$dbh = $this->dbh;
 
 		if ( $this->use_mysqli ) {
-			$success = @mysqli_select_db( $dbh, $db );
+			$success = mysqli_select_db( $dbh, $db );
 		} else {
-			$success = @mysql_select_db( $db, $dbh );
+			$success = mysql_select_db( $db, $dbh );
 		}
 		if ( ! $success ) {
 			$this->ready = false;
@@ -1484,11 +1484,7 @@ class wpdb {
 				}
 			}
 
-			if ( WP_DEBUG ) {
-				mysqli_real_connect( $this->dbh, $host, $this->dbuser, $this->dbpassword, null, $port, $socket, $client_flags );
-			} else {
-				@mysqli_real_connect( $this->dbh, $host, $this->dbuser, $this->dbpassword, null, $port, $socket, $client_flags );
-			}
+			mysqli_real_connect( $this->dbh, $host, $this->dbuser, $this->dbpassword, null, $port, $socket, $client_flags );
 
 			if ( $this->dbh->connect_errno ) {
 				$this->dbh = null;
@@ -1514,11 +1510,7 @@ class wpdb {
 				}
 			}
 		} else {
-			if ( WP_DEBUG ) {
-				$this->dbh = mysql_connect( $this->dbhost, $this->dbuser, $this->dbpassword, $new_link, $client_flags );
-			} else {
-				$this->dbh = @mysql_connect( $this->dbhost, $this->dbuser, $this->dbpassword, $new_link, $client_flags );
-			}
+			$this->dbh = mysql_connect( $this->dbhost, $this->dbuser, $this->dbpassword, $new_link, $client_flags );
 		}
 
 		if ( ! $this->dbh && $allow_bail ) {
@@ -1589,11 +1581,11 @@ class wpdb {
 	 */
 	public function check_connection( $allow_bail = true ) {
 		if ( $this->use_mysqli ) {
-			if ( @mysqli_ping( $this->dbh ) ) {
+			if ( ! empty( $this->dbh ) && mysqli_ping( $this->dbh ) ) {
 				return true;
 			}
 		} else {
-			if ( @mysql_ping( $this->dbh ) ) {
+			if ( ! empty( $this->dbh ) && mysql_ping( $this->dbh ) ) {
 				return true;
 			}
 		}
@@ -1770,12 +1762,12 @@ class wpdb {
 		} else {
 			$num_rows = 0;
 			if ( $this->use_mysqli && $this->result instanceof mysqli_result ) {
-				while ( $row = @mysqli_fetch_object( $this->result ) ) {
+				while ( $row = mysqli_fetch_object( $this->result ) ) {
 					$this->last_result[$num_rows] = $row;
 					$num_rows++;
 				}
 			} elseif ( is_resource( $this->result ) ) {
-				while ( $row = @mysql_fetch_object( $this->result ) ) {
+				while ( $row = mysql_fetch_object( $this->result ) ) {
 					$this->last_result[$num_rows] = $row;
 					$num_rows++;
 				}
@@ -1805,10 +1797,10 @@ class wpdb {
 			$this->timer_start();
 		}
 
-		if ( $this->use_mysqli ) {
-			$this->result = @mysqli_query( $this->dbh, $query );
-		} else {
-			$this->result = @mysql_query( $query, $this->dbh );
+		if ( ! empty( $this->dbh ) && $this->use_mysqli ) {
+			$this->result = mysqli_query( $this->dbh, $query );
+		} elseif ( ! empty( $this->dbh ) ) {
+			$this->result = mysql_query( $query, $this->dbh );
 		}
 		$this->num_queries++;
 
@@ -3016,14 +3008,14 @@ class wpdb {
 			return;
 
 		if ( $this->use_mysqli ) {
-			$num_fields = @mysqli_num_fields( $this->result );
+			$num_fields = mysqli_num_fields( $this->result );
 			for ( $i = 0; $i < $num_fields; $i++ ) {
-				$this->col_info[ $i ] = @mysqli_fetch_field( $this->result );
+				$this->col_info[ $i ] = mysqli_fetch_field( $this->result );
 			}
 		} else {
-			$num_fields = @mysql_num_fields( $this->result );
+			$num_fields = mysql_num_fields( $this->result );
 			for ( $i = 0; $i < $num_fields; $i++ ) {
-				$this->col_info[ $i ] = @mysql_fetch_field( $this->result, $i );
+				$this->col_info[ $i ] = mysql_fetch_field( $this->result, $i );
 			}
 		}
 	}