WMS Service dont work since this version

[anonymous]

What steps will reproduce the problem?

1. download some data at 49.60212 11.0036
2. activate WMS for Erlangen 2013 or 2011
3. zoom in and out

What is the expected result?
visible tiles from WMS

What happens instead?

Red error tiles

Please provide any additional information below. Attach a screenshot if
possible.

in Josm 7006 this WMS is still working.....

Repository Root: http://josm.openstreetmap.de/svn
Build-Date: 2014-04-28 01:33:41
Last Changed Author: Don-vip
Revision: 7018
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
URL: http://josm.openstreetmap.de/svn/trunk
Last Changed Date: 2014-04-28 03:20:05 +0200 (Mon, 28 Apr 2014)
Last Changed Rev: 7018

Identification: JOSM/1.5 (7018 de) Windows XP 32-Bit
Memory Usage: 247 MB / 247 MB (66 MB allocated, but free)
Java version: 1.7.0_55, Oracle Corporation, Java HotSpot(TM) Client VM
Dataset consistency test: No problems found

Plugin: InfoMode (30413)
Plugin: PicLayer (30413)
Plugin: continuosDownload (28565)
Plugin: download_along (30413)
Plugin: geotools (30349)
Plugin: jts (30277)
Plugin: mirrored_download (30413)
Plugin: opendata (30413)
Plugin: openstreetbugs (30413)
Plugin: poly (30413)
Plugin: print (30233)
Plugin: reverter (30413)
Plugin: turnrestrictions (30413)
Plugin: undelete (30413)
Plugin: utilsplugin2 (30413)

[Don-vip]

Indeed:

INFO: Grabbing WMS (attempt 3) https://secure.erlangen.de/arcgiser/services/Luftbilder2013/MapServer/WmsServer?FORMAT=image/bmp&VERSION=1.1.1&SERVICE=WMS&REQUEST=GetMap&LAYERS=Erlangen_ratio5_6.25cm.jp2&STYLES=&SRS=EPSG:4326&WIDTH=500&HEIGHT=500&BBOX=11.0034044,49.6019465,11.0056717,49.6034160
ERROR: java.lang.NullPointerException
java.lang.NullPointerException
	at org.openstreetmap.josm.data.imagery.WmsCache.generateFileName(WmsCache.java:455)
	at org.openstreetmap.josm.data.imagery.WmsCache.saveToCache(WmsCache.java:506)
	at org.openstreetmap.josm.io.imagery.WMSGrabber.grab(WMSGrabber.java:185)
	at org.openstreetmap.josm.io.imagery.WMSGrabber.fetch(WMSGrabber.java:71)
	at org.openstreetmap.josm.io.imagery.Grabber.attempt(Grabber.java:64)
	at org.openstreetmap.josm.io.imagery.Grabber.run(Grabber.java:49)
	at java.lang.Thread.run(Thread.java:745)

[Don-vip]

In 7028/josm:

fix #9962 - NPE in WMS cache (regression from r7012)