diff --git a/adminer/include/driver.inc.php b/adminer/include/driver.inc.php
index a7e05443..8cd1b208 100644
--- a/adminer/include/driver.inc.php
+++ b/adminer/include/driver.inc.php
@@ -268,14 +268,16 @@ AND CHECK_CLAUSE NOT LIKE '% IS NOT NULL'", $this->conn); // ignore default IS N
 	*/
 	function allFields(): array {
 		$return = array();
-		foreach (
-			get_rows("SELECT TABLE_NAME AS tab, COLUMN_NAME AS field, IS_NULLABLE AS nullable, DATA_TYPE AS type, CHARACTER_MAXIMUM_LENGTH AS length" . (JUSH == 'sql' ? ", COLUMN_KEY = 'PRI' AS `primary`" : "") . "
+		if (DB != "") {
+			foreach (
+				get_rows("SELECT TABLE_NAME AS tab, COLUMN_NAME AS field, IS_NULLABLE AS nullable, DATA_TYPE AS type, CHARACTER_MAXIMUM_LENGTH AS length" . (JUSH == 'sql' ? ", COLUMN_KEY = 'PRI' AS `primary`" : "") . "
 FROM INFORMATION_SCHEMA.COLUMNS
 WHERE TABLE_SCHEMA = " . q($_GET["ns"] != "" ? $_GET["ns"] : DB) . "
 ORDER BY TABLE_NAME, ORDINAL_POSITION", $this->conn) as $row
-		) {
-			$row["null"] = ($row["nullable"] == "YES");
-			$return[$row["tab"]][] = $row;
+			) {
+				$row["null"] = ($row["nullable"] == "YES");
+				$return[$row["tab"]][] = $row;
+			}
 		}
 		return $return;
 	}