diff --git a/adminer/drivers/elastic.inc.php b/adminer/drivers/elastic.inc.php
index 6e1df1ef..69f273ba 100644
--- a/adminer/drivers/elastic.inc.php
+++ b/adminer/drivers/elastic.inc.php
@@ -8,13 +8,13 @@ if (isset($_GET["elastic"])) {
 		class Min_DB {
 			var $extension = "JSON", $server_info, $errno, $error, $_url, $_db;
 
-			/** Performs query
-			 * @param string
-			 * @param array
-			 * @param string
-			 * @return mixed
+			/**
+			 * @param string $path
+			 * @param array|null $content
+			 * @param string $method
+			 * @return array|false
 			 */
-			function rootQuery($path, $content = array(), $method = 'GET') {
+			function rootQuery($path, array $content = null, $method = 'GET') {
 				@ini_set('track_errors', 1); // @ - may be disabled
 				$file = @file_get_contents("$this->_url/" . ltrim($path, '/'), false, stream_context_create(array('http' => array(
 					'method' => $method,
@@ -24,39 +24,37 @@ if (isset($_GET["elastic"])) {
 					'follow_location' => 0,
 					'max_redirects' => 0,
 				))));
-				if (!$file) {
-					$this->error = error_get_last()['message'];
-					return $file;
-				}
-				if (!preg_match('~^HTTP/[0-9.]+ 2~i', $http_response_header[0])) {
-					$this->error = lang('Invalid credentials.') . " $http_response_header[0]";
+
+				if ($file === false) {
+					$this->error = lang('Invalid credentials.');
 					return false;
 				}
+
 				$return = json_decode($file, true);
 				if ($return === null) {
-					$this->errno = json_last_error();
-					if (function_exists('json_last_error_msg')) {
-						$this->error = json_last_error_msg();
-					} else {
-						$constants = get_defined_constants(true);
-						foreach ($constants['json'] as $name => $value) {
-							if ($value == $this->errno && preg_match('~^JSON_ERROR_~', $name)) {
-								$this->error = $name;
-								break;
-							}
-						}
-					}
+					$this->error = lang('Invalid credentials.');
+					return false;
 				}
+
+				if (!preg_match('~^HTTP/[0-9.]+ 2~i', $http_response_header[0])) {
+					if (isset($return['error']['root_cause'][0]['type'])) {
+						$this->error = $return['error']['root_cause'][0]['type'] . ": " . $return['error']['root_cause'][0]['reason'];
+					} else {
+						$this->error = lang('Invalid credentials.');
+					}
+					return false;
+				}
+
 				return $return;
 			}
 
 			/** Performs query relative to actual selected DB
-			 * @param string
-			 * @param array
-			 * @param string
-			 * @return mixed
+			 * @param string $path
+			 * @param array|null $content
+			 * @param string $method
+			 * @return array|false
 			 */
-			function query($path, $content = array(), $method = 'GET') {
+			function query($path, array $content = null, $method = 'GET') {
 				return $this->rootQuery(($this->_db != "" ? "$this->_db/" : "/") . ltrim($path, '/'), $content, $method);
 			}
 
@@ -70,10 +68,17 @@ if (isset($_GET["elastic"])) {
 				$this->_url = build_http_url($server, $username, $password, "localhost", 9200);
 
 				$return = $this->query('');
-				if ($return) {
-					$this->server_info = $return['version']['number'];
+				if (!$return) {
+					return false;
 				}
-				return (bool) $return;
+
+				if (!isset($return['version']['number'])) {
+					$this->error = lang('Invalid credentials.');
+					return false;
+				}
+
+				$this->server_info = $return['version']['number'];
+				return true;
 			}
 
 			function select_db($database) {
diff --git a/plugins/drivers/clickhouse.php b/plugins/drivers/clickhouse.php
index 1d188219..2e1d95c4 100644
--- a/plugins/drivers/clickhouse.php
+++ b/plugins/drivers/clickhouse.php
@@ -8,6 +8,11 @@ if (isset($_GET["clickhouse"])) {
 		var $extension = "JSON", $server_info, $errno, $_result, $error, $_url;
 		var $_db = 'default';
 
+		/**
+		 * @param string $db
+		 * @param string $query
+		 * @return Min_Result|bool
+		 */
 		function rootQuery($db, $query) {
 			@ini_set('track_errors', 1); // @ - may be disabled
 			$file = @file_get_contents("$this->_url/?database=$db", false, stream_context_create(array('http' => array(
@@ -20,39 +25,48 @@ if (isset($_GET["clickhouse"])) {
 			))));
 
 			if ($file === false) {
-				$this->error = $php_errormsg;
-				return $file;
-			}
-			if (!preg_match('~^HTTP/[0-9.]+ 2~i', $http_response_header[0])) {
-				$this->error = lang('Invalid credentials.') . " $http_response_header[0]";
+				$this->error = lang('Invalid credentials.');
 				return false;
 			}
-			$return = json_decode($file, true);
-			if ($return === null) {
-				if (!$this->isQuerySelectLike($query) && $file === '') {
-					return true;
-				}
 
-				$this->errno = json_last_error();
-				if (function_exists('json_last_error_msg')) {
-					$this->error = json_last_error_msg();
-				} else {
-					$constants = get_defined_constants(true);
-					foreach ($constants['json'] as $name => $value) {
-						if ($value == $this->errno && preg_match('~^JSON_ERROR_~', $name)) {
-							$this->error = $name;
-							break;
-						}
+			if (!preg_match('~^HTTP/[0-9.]+ 2~i', $http_response_header[0])) {
+				foreach ($http_response_header as $header) {
+					if (preg_match('~^X-ClickHouse-Exception-Code:~i', $header)) {
+						$this->error = preg_replace('~\(version [^(]+\(.+$~', '', $file);
+						return false;
 					}
 				}
+
+				$this->error = lang('Invalid credentials.');
+				return false;
 			}
-			return new Min_Result($return);
+
+			if (!$this->isQuerySelectLike($query) && $file === '') {
+				return true;
+			}
+
+			$return = json_decode($file, true);
+			if ($return === null) {
+				$this->error = lang('Invalid credentials.');
+				return false;
+			}
+
+			if (!isset($return['rows']) || !isset($return['data']) || !isset($return['meta'])) {
+				$this->error = lang('Invalid credentials.');
+				return false;
+			}
+
+			return new Min_Result($return['rows'], $return['data'], $return['meta']);
 		}
 
 		function isQuerySelectLike($query) {
 			return (bool) preg_match('~^(select|show)~i', $query);
 		}
 
+		/**
+		 * @param string $query
+		 * @return bool|Min_Result
+		 */
 		function query($query) {
 			return $this->rootQuery($this->_db, $query);
 		}
@@ -100,11 +114,17 @@ if (isset($_GET["clickhouse"])) {
 	class Min_Result {
 		var $num_rows, $_rows, $columns, $meta, $_offset = 0;
 
-		function __construct($result) {
-			$this->num_rows = $result['rows'];
-			$this->_rows = $result['data'];
-			$this->meta = $result['meta'];
-			$this->columns = array_column($this->meta, 'name');
+		/**
+		 * @param int $rows
+		 * @param array[] $data
+		 * @param array[] $meta
+		 */
+		function __construct($rows, array $data, array $meta) {
+			$this->num_rows = $rows;
+			$this->_rows = $data;
+			$this->meta = $meta;
+			$this->columns = array_column($meta, 'name');
+
 			reset($this->_rows);
 		}