[JavaScript Error: "_tagsByID is not defined"

At the moment I can't delete or rename tags. Zotero 1.5a1.r3545
I get the javascript error
[JavaScript Error: "_tagsByID is not defined" {file: "chrome://zotero/content/xpcom/data/tags.js" line 63
error id 957980492

debug output:zotero(5): Binding parameter 1 of type string: "Advertising"

zotero(5): DROP TABLE tmpSearchResults_XnHLqGWk

zotero(5): Committing transaction

zotero(3): Resetting Notifier event queue

zotero(5): Beginning DB transaction

zotero(3): Beginning Notifier event queue

zotero(5): CREATE TEMPORARY TABLE tmpSearchResults_Uhlhp5Ra (itemID INT)

zotero(5): INSERT INTO tmpSearchResults_Uhlhp5Ra VALUES (?)

zotero(5): CREATE INDEX tmpSearchResults_Uhlhp5Ra_itemID ON tmpSearchResults_Uhlhp5Ra(itemID)

zotero(5): Committing transaction

zotero(3): Resetting Notifier event queue

zotero(5): SELECT DISTINCT tagID, name, type FROM itemTags NATURAL JOIN tags WHERE itemID IN (SELECT itemID FROM tmpSearchResults_
Uhlhp5Ra)

zotero(5): DROP TABLE tmpSearchResults_Uhlhp5Ra

zotero(3): Refreshing tags selector

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