Ticket #39195: 39195.patch

src/wp-includes/class-wp-image-editor-imagick.php

@@ -149 +149 @@
                         $file_parts = pathinfo( $this->file );
                         $filename = $this->file;
 
-                        if ( 'pdf' == strtolower( $file_parts['extension'] ) ) {
+                        if ( ! empty( $file_parts['extension'] ) && 'pdf' == strtolower( $file_parts['extension'] ) ) {
                                 $filename = $this->pdf_setup();
                         }