Undefined Property notice occurring when editing a rule

Following notices occurs when editing a rule:
Notice: Undefined property: RulesReactionRule::$dirty in RulesEventSet::rebuildEventCache() (line 791 of sites/all/modules/rules/includes/rules.plugins.inc).
Notice: Undefined property: RulesReactionRule::$dirty in RulesEventSet::rebuildEventCache() (line 794 of sites/all/modules/rules/includes/rules.plugins.inc).

Rule edited:
{ "rules_testrule2" : {
    "LABEL" : "testrule2",
    "PLUGIN" : "reaction rule",
    "REQUIRES" : [ "rules", "comment" ],
    "ON" : { "comment_view--comment_node_ads" : { "bundle" : "comment_node_ads" } },
    "IF" : [ { "node_is_published" : { "node" : [ "comment:node" ] } } ],
    "DO" : [ { "redirect" : { "url" : "http:\u002F\u002Fdrupal.org" } } ]
  }
}

Configuration:
Drupal core: 7.31
Rules module: 7.x-2.x-dev (Development release dated 2014-May-14)
PHP : 5.2.6