- Some minor improvements

Author: rkrx

src/Builder/Helpers/FieldValueConverter.php

@@ -24,9 +24,9 @@ public static function convertValues(array $row, array $columnDefinitions) {
 	private static function convertValue($value, $type) {
 		switch ($type) {
 			case 'i':
-				return (int) $value;
+				return $value !== null ? (int) $value : null;
 			case 'f':
-				return (float) $value;
+				return $value !== null ? (float) $value : null;
 		}
 		return $value;
 	}