Index: typo3/sysext/rtehtmlarea/htmlarea/plugins/TextStyle/text-style.js
===================================================================
--- typo3/sysext/rtehtmlarea/htmlarea/plugins/TextStyle/text-style.js	(révision 9416)
+++ typo3/sysext/rtehtmlarea/htmlarea/plugins/TextStyle/text-style.js	(copie de travail)
@@ -397,6 +397,7 @@
 			if (classNames.length && (selectionEmpty || fullNodeSelected)) {
 				this.setSelectedOption(dropDown, classNames);
 			}
+			var store = dropDown.getStore();
 			dropDown.setDisabled(!(store.getCount()>1) || disabled);
 		}
 	}