Ticket #31954: 31954.patch

src/wp-includes/taxonomy.php

@@ -3376 +3376 @@
         if ( is_wp_error( $term ) )
                 return $term;
 
+        if ( null === $term ) {
+                return new WP_Error( 'invalid_term', __( 'Empty term' ) );
+        }
+
         // Escape data pulled from DB.
         $term = wp_slash($term);
 

tests/phpunit/tests/term/wpUpdateTerm.php

@@ -653 +653 @@
 
                 _unregister_taxonomy( 'wptests_tax' );
         }
+
+        public function test_wp_update_term_with_null_get_term() {
+                $t = $this->factory->term->create( array( 'taxonomy' => 'category' ) );
+                $found = wp_update_term( $t, 'post_tag', array( 'slug' => 'foo' ) );
+
+                $this->assertWPError( $found );
+                $this->assertSame( 'invalid_term', $found->get_error_code() );
+        }
 }