Ticket #42319: 42319.patch

src/wp-includes/class-wp-hook.php

@@ -288 +288 @@
                                         $value = call_user_func_array( $the_['function'], array_slice( $args, 0, (int)$the_['accepted_args'] ) );
                                 }
                         }
-                } while ( false !== next( $this->iterations[ $nesting_level ] ) );
+                } while ( ! is_null( $this->iterations[ $nesting_level ] ) && false !== next( $this->iterations[ $nesting_level ] ) );
 
                 unset( $this->iterations[ $nesting_level ] );
                 unset( $this->current_priority[ $nesting_level ] );
@@ -331 +331 @@
                         foreach ( $this->callbacks[ $priority ] as $the_ ) {
                                 call_user_func_array( $the_['function'], $args );
                         }
-                } while ( false !== next( $this->iterations[ $nesting_level ] ) );
+                } while ( ! is_null( $this->iterations[ $nesting_level ] ) && false !== next( $this->iterations[ $nesting_level ] ) );
 
                 unset( $this->iterations[ $nesting_level ] );
                 $this->nesting_level--;