Remove check_str function call

sql_backup.php

@@ -139,7 +139,7 @@
 				foreach ($result_2 as &$row_2) {
 					foreach ($column_array as $column) {
 						$columns[] = $column;
-						$values[] = $row_2[$column] != '' ? "'".check_str($row_2[$column])."'" : 'null';
+						$values[] = $row_2[$column] != '' ? "'".($row_2[$column] ?? '')."'" : 'null';
 					}
 					$sql = "insert into ".$table_name." (";
 					$sql .= implode(', ', $columns);

sql_db_conversion.php

@@ -479,7 +479,7 @@
 										//	$sql .= "'".$dest_domain_uuid."',";
 										//}
 										//else {
-											$sql .= "'".check_str($row[$column])."', ";
+											$sql .= "'".($row[$column] ?? '')."', ";
 										//}
 									}
 									else {
@@ -487,7 +487,7 @@
 										//	$sql .= "'".$dest_domain_uuid."'";
 										//}
 										//else {
-											$sql .= "'".check_str($row[$column])."'";
+											$sql .= "'".($row[$column] ?? '')."'";
 										//}
 									}
 									$x++;