Version 5.0.0 beta 10

system/Widget/Widget.php

@@ -1366,7 +1366,17 @@ abstract class Widget
 							}
 							
 							$caches[ $cacheKey ] = time();
-							Db::i()->update( 'core_widgets', array( 'caches' => json_encode( $caches ) ), static::_buildWhere( $this->key, $this->app ) );
+
+							$keyForCacheStore = $this->key;
+
+							if( in_array( Polymorphic::class, class_implements( $this ) ) )
+							{
+								/* @var Polymorphic $widgetClass */
+								$widgetClass = get_class( $this );
+								$keyForCacheStore = $widgetClass::getBaseKey();
+							}
+
+							Db::i()->update( 'core_widgets', array( 'caches' => json_encode( $caches ) ), static::_buildWhere( $keyForCacheStore, $this->app ) );
 						}
 						
 						/* Then use what the store has */