diff --git a/src/wp-includes/media.php b/src/wp-includes/media.php
index 7b99f95980..ef6baa7bc2 100644
--- a/src/wp-includes/media.php
+++ b/src/wp-includes/media.php
@@ -985,7 +985,7 @@ function wp_calculate_image_srcset( $size_array, $image_src, $image_meta, $attac
 	 */
 	$image_meta = apply_filters( 'wp_calculate_image_srcset_meta', $image_meta, $size_array, $image_src, $attachment_id );
 
-	if ( empty( $image_meta['sizes'] ) || strlen( $image_meta['file'] ) < 4 ) {
+	if ( empty( $image_meta['sizes'] ) || ! isset( $image_meta['file'] ) || strlen( $image_meta['file'] ) < 4 ) {
 		return false;
 	}
 
diff --git a/tests/phpunit/tests/media.php b/tests/phpunit/tests/media.php
index 5399f858d3..5b68f327e3 100644
--- a/tests/phpunit/tests/media.php
+++ b/tests/phpunit/tests/media.php
@@ -1183,17 +1183,22 @@ EOF;
 		$image_meta2['sizes'] = '';
 		$this->assertFalse( wp_calculate_image_srcset( $size_array, $image_src, $image_meta2 ) );
 
+		// File name is incorrect
+		$image_meta3 = $image_meta;
+		$image_meta3['file'] = '/';
+		$this->assertFalse( wp_calculate_image_srcset( $size_array, $image_src, $image_meta3 ) );
+
 		// File name is incorrect
 		$image_meta4 = $image_meta;
-		$image_meta4['file'] = '/';
+		unset( $image_meta4['file'] );
 		$this->assertFalse( wp_calculate_image_srcset( $size_array, $image_src, $image_meta4 ) );
 
 		// Intermediate size is string instead of array.
-		$image_meta3 = $image_meta;
-		$image_meta3['sizes']['medium_large'] = '';
+		$image_meta5 = $image_meta;
+		$image_meta5['sizes']['medium_large'] = '';
 		unset( $srcset[768] );
 		$expected_srcset = implode( ', ', $srcset );
-		$this->assertSame( $expected_srcset, wp_calculate_image_srcset( $size_array, $image_src, $image_meta3 ) );
+		$this->assertSame( $expected_srcset, wp_calculate_image_srcset( $size_array, $image_src, $image_meta5 ) );
 	}
 
 	/**