Errors after update

[boblgum]

Hi @ll,
just installed updates from 27.05. But now i'm getting some strange errors caused by opening "Portal" and/or "Contacts"

JSNCON-0002 Categories=ERROR Message='A JSON error occurred: Unexpected character ('U' (code 85)): was expecting comma to separate OBJECT entries
 at [Source: com.openexchange.java.AsciiReader@52c9f3c7; line: 1, column: 1059]' exceptionID=-85397451-45
	at com.openexchange.exception.OXExceptionFactory.create(OXExceptionFactory.java:158)
	at com.openexchange.jslob.JSlobExceptionCodes.create(JSlobExceptionCodes.java:178)
	at com.openexchange.jslob.storage.db.DBJSlobStorage.load(DBJSlobStorage.java:390)
	at com.openexchange.jslob.storage.db.DBJSlobStorage.opt(DBJSlobStorage.java:360)
.....
Caused by: org.json.JSONException: Unexpected character ('U' (code 85)): was expecting comma to separate OBJECT entries
 at [Source: com.openexchange.java.AsciiReader@52c9f3c7; line: 1, column: 1059]
	at org.json.JSONObject.parse(JSONObject.java:1499)
.....
Caused by: com.fasterxml.jackson.core.JsonParseException: Unexpected character ('U' (code 85)): was expecting comma to separate OBJECT entries
 at [Source: com.openexchange.java.AsciiReader@52c9f3c7; line: 1, column: 1059]
	at com.fasterxml.jackson.core.JsonParser._constructError(JsonParser.java:1378)
	at com.fasterxml.jackson.core.base.ParserMinimalBase._reportError(ParserMinimalBase.java:599)
	at com.fasterxml.jackson.core.base.ParserMinimalBase._reportUnexpectedChar(ParserMinimalBase.java:520)
	at com.fasterxml.jackson.core.json.ReaderBasedJsonParser.nextToken(ReaderBasedJsonParser.java:601)
	at org.json.JSONObject.parse(JSONObject.java:1495)

any ideas?