diff --git a/wp-tevko-responsive-images.php b/wp-tevko-responsive-images.php
index b398c2d..d2e8d79 100644
--- a/wp-tevko-responsive-images.php
+++ b/wp-tevko-responsive-images.php
@@ -342,13 +342,12 @@ function _tevkori_filter_content_images_callback( $image ) {
 	}
 
 	if ( $id && false === $size ) {
-		preg_match( '/width="([0-9]+)"/', $atts, $width );
-		preg_match( '/height="([0-9]+)"/', $atts, $height );
-
-		$size = array(
-			(int) $width[1],
-			(int) $height[1]
-		);
+		if ( preg_match( '/ width="([0-9]+)"/', $atts, $width ) && preg_match( '/ height="([0-9]+)"/', $atts, $height ) ) {
+			$size = array(
+				(int) $width[1],
+				(int) $height[1]
+			);
+		}
 	}
 
 	/*