Exception when requesting execution history

Got a stack trace when I had the following:
I deployed helloworld and did ant sendhello
I deployed version 2 of helloworld and did ant sendhello
I then deployed simple_correlation, did ant sendhello/sendgoodbye and then ant sendhello2

so this setup the state of the db when I then started the console.

Did a few history record checks, then went to manage instances, opened helloworld version 2, and selected the 'more...->execution history'. Then it threw the exception:

Messages
TRACE DEBUG INFO WARN ERROR FATAL OFF Clear
2011-03-28 10:55:43,749 [DEBUG] new subscription: org.jboss.bpm.monitor.gui.client.HistoryRecords:RPC.getProcessDefinitionKeys::RespondTo:1 -> org.jboss.errai.bus.client.api.builder.AbstractRemoteCallBuilder$1$1@e0
2011-03-28 10:55:43,752 [DEBUG] New Subscription: org.jboss.bpm.monitor.gui.client.HistoryRecords:RPC.getProcessDefinitionKeys::RespondTo:1
2011-03-28 10:56:34,134 [DEBUG] GET: http://localhost:8080/gwt-console-server/rs/history/search?definitionkey=%7Bhttp://www.jboss.org/bpel/examples%7DHelloGoodbye-1&status=COMPLETED&starttime=1044057600000&endtime=1301306194133
2011-03-28 10:56:34,265 [DEBUG] Loaded 1 process instance(s) : {"historyEntires":[{"processInstanceId":"3","processDefinitionId":"

{http://www.jboss.org/bpel/examples}

HelloGoodbye-1","key":"Session\u003d[1]","state":"COMPLETED","startTime":"2011-03-28 10:55:08","endTime":"2011-03-28 10:55:13","duration":0}]}
2011-03-28 10:56:45,106 [DEBUG] GET: http://localhost:8080/gwt-console-server/rs/history/search?definitionkey=%7Bhttp://www.jboss.org/bpel/examples%7DHelloWorld-1&status=COMPLETED&starttime=1044057600000&endtime=1301306205105
2011-03-28 10:56:45,206 [DEBUG] Loaded 1 process instance(s) : {"historyEntires":[{"processInstanceId":"1","processDefinitionId":"

{http://www.jboss.org/bpel/examples}

HelloWorld-1","state":"COMPLETED","startTime":"2011-03-28 10:54:23","endTime":"2011-03-28 10:54:24","duration":0}]}
2011-03-28 10:57:02,328 [DEBUG] GET: http://localhost:8080/gwt-console-server/rs/history/search?definitionkey=%7Bhttp://www.jboss.org/bpel/examples%7DHelloWorld-2&status=COMPLETED&starttime=1044057600000&endtime=1301306222327
2011-03-28 10:57:02,390 [DEBUG] Loaded 1 process instance(s) : {"historyEntires":[{"processInstanceId":"2","processDefinitionId":"

{http://www.jboss.org/bpel/examples}

HelloWorld-2","state":"COMPLETED","startTime":"2011-03-28 10:54:45","endTime":"2011-03-28 10:54:45","duration":0}]}
2011-03-28 10:57:50,241 [DEBUG] ToolID: Manage_Instances.1
2011-03-28 10:57:52,949 [DEBUG] GET: http://localhost:8080/gwt-console-server/rs/process/definitions
2011-03-28 10:57:53,194 [INFO ] Loaded 3 process definitions in 67 ms
2011-03-28 10:57:58,028 [DEBUG] GET: http://localhost:8080/gwt-console-server/rs/process/definition/e2h0dHA6Ly93d3cuamJvc3Mub3JnL2JwZWwvZXhhbXBsZXN9SGVsbG9Xb3JsZC0y/instances
2011-03-28 10:57:58,074 [INFO ] Loaded 0 process instance(s) in 5 ms
2011-03-28 10:58:04,909 [ERROR] receiver 'Workspace' threw an exception<br/>Additional details:<br/> <table><thead style='font-weight:bold;'><tr><td>Field</td><td>Value</td></tr></thead><tbody><tr><td>ToSubject</td><td>Workspace</td></tr><tr><td>CommandType</td><td>ActivateTool</td></tr><tr><td>TOOL</td><td>Execution_History.1</td></tr><tr><td>TOOLSET</td><td>ToolSet_Processes</td></tr></tbody></table>
com.google.gwt.core.client.JavaScriptException:
(TypeError): l is null
fileName: http://localhost:8080/bpel-console/app/BCF8031F1D3BDCAFB0BCB19F2A1D92B2.cache.html
lineNumber: 2534
stack: Fjd([object Object],"ToolSet_Processes","Execution_History.1")@http://localhost:8080/bpel-console/app/BCF8031F1D3BDCAFB0BCB19F2A1D92B2.cache.html:2534
Njd([object Object])@http://localhost:8080/bpel-console/app/BCF8031F1D3BDCAFB0BCB19F2A1D92B2.cache.html:2179
uad([object Object])@http://localhost:8080/bpel-console/app/BCF8031F1D3BDCAFB0BCB19F2A1D92B2.cache.html:2877
("Workspace","

{\"ToSubject\":\"Workspace\",\"CommandType\":\"ActivateTool\",\"TOOL\":\"Execution_History.1\",\"TOOLSET\":\"ToolSet_Processes\"}

",null)@http://localhost:8080/bpel-console/app/BCF8031F1D3BDCAFB0BCB19F2A1D92B2.cache.html:2927
([object Object],[object Array],1,"Workspace","

{\"ToSubject\":\"Workspace\",\"CommandType\":\"ActivateTool\",\"TOOL\":\"Execution_History.1\",\"TOOLSET\":\"ToolSet_Processes\"}

")@http://localhost:8080/bpel-console/app/js/pagebus.js:128
([object Object],[object Array],0,"Workspace","

{\"ToSubject\":\"Workspace\",\"CommandType\":\"ActivateTool\",\"TOOL\":\"Execution_History.1\",\"TOOLSET\":\"ToolSet_Processes\"}

")@http://localhost:8080/bpel-console/app/js/pagebus.js:104
("Workspace","

{\"ToSubject\":\"Workspace\",\"CommandType\":\"ActivateTool\",\"TOOL\":\"Execution_History.1\",\"TOOLSET\":\"ToolSet_Processes\"}

")@http://localhost:8080/bpel-console/app/js/pagebus.js:68
("Workspace","

{\"ToSubject\":\"Workspace\",\"CommandType\":\"ActivateTool\",\"TOOL\":\"Execution_History.1\",\"TOOLSET\":\"ToolSet_Processes\"}

")@http://localhost:8080/bpel-console/app/js/pagebus.js:235
("Workspace","

{\"ToSubject\":\"Workspace\",\"CommandType\":\"ActivateTool\",\"TOOL\":\"Execution_History.1\",\"TOOLSET\":\"ToolSet_Processes\"}

")@http://localhost:8080/bpel-console/app/js/pagebus.js:294
v9c([object Object],[object Object])@http://localhost:8080/bpel-console/app/BCF8031F1D3BDCAFB0BCB19F2A1D92B2.cache.html:3091
J9c([object Object],[object Object])@http://localhost:8080/bpel-console/app/BCF8031F1D3BDCAFB0BCB19F2A1D92B2.cache.html:3162
P5c([object Object],[object Object])@http://localhost:8080/bpel-console/app/BCF8031F1D3BDCAFB0BCB19F2A1D92B2.cache.html:1283
F2c()@http://localhost:8080/bpel-console/app/BCF8031F1D3BDCAFB0BCB19F2A1D92B2.cache.html:2431
vrb([object Object],1301306284898)@http://localhost:8080/bpel-console/app/BCF8031F1D3BDCAFB0BCB19F2A1D92B2.cache.html:3187
Jrb()@http://localhost:8080/bpel-console/app/BCF8031F1D3BDCAFB0BCB19F2A1D92B2.cache.html:2406
EB()@http://localhost:8080/bpel-console/app/BCF8031F1D3BDCAFB0BCB19F2A1D92B2.cache.html:2033
(0)@http://localhost:8080/bpel-console/app/BCF8031F1D3BDCAFB0BCB19F2A1D92B2.cache.html:2587
mE((function ()

{var a;k4d[a = ++l4d] = null;m4d[a] = Iae + Tae, b.Db();l4d = a - 1;}

),[object XPCCrossOriginWrapper],[object Object])@http://localhost:8080/bpel-console/app/BCF8031F1D3BDCAFB0BCB19F2A1D92B2.cache.html:3143
(0)@http://localhost:8080/bpel-console/app/BCF8031F1D3BDCAFB0BCB19F2A1D92B2.cache.html:2474
at Unknown.fF(JsArrayString.java:42)
at Unknown.fC(StackTraceCreator.java:366)
at Unknown.Lmb(Exceptions.java:29)
at Unknown.Fjd(Workspace.java:194)
at Unknown.Njd(Workspace.java:91)
at Unknown.uad(ClientMessageBusImpl.java:225)
at Unknown.anonymous(JSONUtilCli.java:102)
at Unknown.v9c(ClientMessageBusImpl.java:1023)
at Unknown.J9c(ClientMessageBusImpl.java:336)
at Unknown.P5c(CommandMessage.java:503)
at Unknown.F2c(ErraiBus.java:30)
at Unknown.vrb(CommandExecutor.java:310)
at Unknown.Jrb(Duration.java:29)
at Unknown.EB(Timer.java:141)
at Unknown.anonymous(Timer.java:60)
at Unknown.mE(Impl.java:146)
at Unknown.anonymous(Impl.java:56)
2011-03-28 10:58:04,912 [ERROR] No subscribers for: process.execution.history<br/>Additional details:<br/> Attempt to send message to subject for which there are no subscribers