Move the sources array check.

Author: dero

php/class-media.php

@@ -1875,11 +1875,6 @@ public function image_srcset( $sources, $size_array, $image_src, $image_meta, $a
 			return $sources; // Return WordPress default sources.
 		}
 
-		// Handle unexpected sources variable type.
-		if ( ! is_array( $sources ) ) {
-			return $sources;
-		}
-
 		// Get transformations if any.
 		$transformations = Relate::get_transformations( $attachment_id );
 
@@ -1931,6 +1926,11 @@ function ( $item ) use ( $crop ) {
 			}
 		}
 
+		// Handle unexpected sources variable type.
+		if ( ! is_array( $sources ) ) {
+			return $sources;
+		}
+
 		// Add the main size as the largest srcset src.
 		$crop = $this->get_crop_from_transformation( $transformations );
 		if ( ! empty( $crop ) ) {