Error when creating Service Desk request with Notify Hipchat post function in Create Issue transition

Error when creating Service Desk request with Notify Hipchat post function in Create Issue transition. This might be related to having username that has a combination of uppercase and lowercase letter as well.

Steps to Reproduce

1. Access Customer Portal with a Username that has combination of uppercase and lowercase letters.
2. Tried to create a request with Notify Hipchat post function in the create issue transition
3. Getting an error
   
4. JIRA logs is showing

   2015-02-16 12:32:06,275 TP-Processor25 ERROR PJoseph 752x192301x1 p764so 211.25.19.194,165.254.226.162 /servicedesk/customer/portal/2/create/54 [feature.customer.request.ServiceDeskWorkflowInitializationManager] Error initializing workflow
   java.lang.NullPointerException
           at com.atlassian.labs.jira.workflow.HipChatPostFunction.execute(HipChatPostFunction.java:75)
           at com.opensymphony.workflow.AbstractWorkflow.executeFunction(AbstractWorkflow.java:1050)
           at com.opensymphony.workflow.AbstractWorkflow.transitionWorkflow(AbstractWorkflow.java:1446)
           at com.opensymphony.workflow.AbstractWorkflow.initialize(AbstractWorkflow.java:615)
           at com.atlassian.servicedesk.internal.feature.customer.request.ServiceDeskWorkflowInitializationManager$$anonfun$initializeWorkflow$1$$anonfun$apply$1$$anonfun$apply$2.apply(ServiceDeskWorkflowInitializationManager.scala:60)
           at com.atlassian.servicedesk.internal.feature.customer.request.ServiceDeskWorkflowInitializationManager$$anonfun$initializeWorkflow$1$$anonfun$apply$1$$anonfun$apply$2.apply(ServiceDeskWorkflowInitializationManager.scala:58)
           at scalaz.$bslash$div$class.map(Either.scala:94)
           at scalaz.$bslash$div$minus.map(Either.scala:283)
           at com.atlassian.servicedesk.internal.feature.customer.request.ServiceDeskWorkflowInitializationManager$$anonfun$initializeWorkflow$1$$anonfun$apply$1.apply(ServiceDeskWorkflowInitializationManager.scala:58)
           at com.atlassian.servicedesk.internal.feature.customer.request.ServiceDeskWorkflowInitializationManager$$anonfun$initializeWorkflow$1$$anonfun$apply$1.apply(ServiceDeskWorkflowInitializationManager.scala:56)
           at scalaz.$bslash$div$class.flatMap(Either.scala:117)
           at scalaz.$bslash$div$minus.flatMap(Either.scala:283)
           at com.atlassian.servicedesk.internal.feature.customer.request.ServiceDeskWorkflowInitializationManager$$anonfun$initializeWorkflow$1.apply(ServiceDeskWorkflowInitializationManager.scala:56)
           at com.atlassian.servicedesk.internal.feature.customer.request.ServiceDeskWorkflowInitializationManager$$anonfun$initializeWorkflow$1.apply(ServiceDeskWorkflowInitializationManager.scala:54)
           at scalaz.$bslash$div$class.flatMap(Either.scala:117)
           at scalaz.$bslash$div$minus.flatMap(Either.scala:283)
           at com.atlassian.servicedesk.internal.feature.customer.request.ServiceDeskWorkflowInitializationManager.initializeWorkflow(ServiceDeskWorkflowInitializationManager.scala:54)
           at com.atlassian.servicedesk.internal.feature.customer.request.ServiceDeskWorkflowInitializationManager.initializeWorkflowForIssue(ServiceDeskWorkflowInitializationManager.scala:35)
           at com.atlassian.servicedesk.internal.feature.customer.request.CustomerRequestManager.com$atlassian$servicedesk$internal$feature$customer$request$CustomerRequestManager$$saveIssueIntoJIRA(CustomerRequestManager.scala:128)
           at com.atlassian.servicedesk.internal.feature.customer.request.CustomerRequestManager$$anonfun$createRequest$2$$anonfun$apply$1$$anonfun$apply$2.apply(CustomerRequestManager.scala:82)
           at com.atlassian.servicedesk.internal.feature.customer.request.CustomerRequestManager$$anonfun$createRequest$2$$anonfun$apply$1$$anonfun$apply$2.apply(CustomerRequestManager.scala:73)
           at scalaz.$bslash$div$class.flatMap(Either.scala:117)
           at scalaz.$bslash$div$minus.flatMap(Either.scala:283)
           at com.atlassian.servicedesk.internal.feature.customer.request.CustomerRequestManager$$anonfun$createRequest$2$$anonfun$apply$1.apply(CustomerRequestManager.scala:73)
           at com.atlassian.servicedesk.internal.feature.customer.request.CustomerRequestManager$$anonfun$createRequest$2$$anonfun$apply$1.apply(CustomerRequestManager.scala:72)
           at scalaz.$bslash$div$class.flatMap(Either.scala:117)
   

Possible Workaround
Check if the username has combination of uppercase and lowercase letters. Try to replace it with all lowercase and check how it goes.