diff --git a/includes/rules.core.inc b/includes/rules.core.inc
index 559d1cf..8255707 100644
--- a/includes/rules.core.inc
+++ b/includes/rules.core.inc
@@ -229,6 +229,10 @@ class RulesEntityController extends EntityAPIControllerExportable {
    * @see EntityAPIControllerExportable::buildQuery()
    */
   protected function buildQuery($ids, $conditions = array(), $revision_id = FALSE) {
+    if (!isset($this->entityInfo['schema_fields_sql']['base table'])) {
+      throw new RulesConfigLoadFailedException();
+    }
+
     $query = parent::buildQuery($ids, $conditions, $revision_id);
     $query_conditions =& $query->conditions();
     foreach ($query_conditions as &$condition) {
@@ -2782,6 +2786,8 @@ class RulesIntegrityException extends RulesException {
  */
 class RulesDependencyException extends RulesIntegrityException {}
 
+class RulesConfigLoadFailedException extends RulesException {}
+
 /**
  * Determines the plugin to be used for importing a child element.
  *
diff --git a/includes/rules.plugins.inc b/includes/rules.plugins.inc
index 90b306d..2355a77 100644
--- a/includes/rules.plugins.inc
+++ b/includes/rules.plugins.inc
@@ -761,7 +761,12 @@ class RulesEventSet extends RulesRuleSet {
     $events = rules_fetch_data('event_info');
     $sets = array();
     // Add all rules associated with this event to an EventSet for caching.
-    $rules = rules_config_load_multiple(FALSE, array('plugin' => 'reaction rule', 'active' => TRUE));
+    try {
+      $rules = rules_config_load_multiple(FALSE, array('plugin' => 'reaction rule', 'active' => TRUE));
+    }
+    catch (RulesConfigLoadFailedException $e) {
+      $rules = array();
+    }
 
     foreach ($rules as $name => $rule) {
       foreach ($rule->events() as $event_name) {