Index: trunk/wp-admin/includes/image.php
===================================================================
--- trunk/wp-admin/includes/image.php	(Revision 23185)
+++ trunk/wp-admin/includes/image.php	(Arbeitskopie)
@@ -92,9 +92,9 @@
 			else
 				$sizes[$s]['height'] = get_option( "{$s}_size_h" ); // For default sizes set in options
 			if ( isset( $_wp_additional_image_sizes[$s]['crop'] ) )
-				$sizes[$s]['crop'] = intval( $_wp_additional_image_sizes[$s]['crop'] ); // For theme-added sizes
+				$sizes[$s]['crop'] = (bool) intval( $_wp_additional_image_sizes[$s]['crop'] ); // For theme-added sizes
 			else
-				$sizes[$s]['crop'] = get_option( "{$s}_crop" ); // For default sizes set in options
+				$sizes[$s]['crop'] = (bool) get_option( "{$s}_crop" ); // For default sizes set in options
 		}
 
 		$sizes = apply_filters( 'intermediate_image_sizes_advanced', $sizes );