Uploading custom avatar fails with 500 error

New implementation for avatar uploading of JIRA breaks SD when we are trying to upload new avatar for profile

Found on OD instance https://nov11.jira-dev.com (login as admin/admin) - JIRA Version : 6.4-OD9
Steps:
1. Go to any SD project
2. Go to Customer Portal page by click on "Customer Portal" link in "Settings" tab
3. Go to upload new avatar for profile

Stack-trace:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?><status><status-code>500</status-code><message>com.atlassian.jira.avatar.AvatarImpl.createCustomAvatar(Ljava/lang/String;Ljava/lang/String;Lcom/atlassian/jira/user/ApplicationUser;)Lcom/atlassian/jira/avatar/AvatarImpl;</message><stack-trace>java.lang.NoSuchMethodError: com.atlassian.jira.avatar.AvatarImpl.createCustomAvatar(Ljava/lang/String;Ljava/lang/String;Lcom/atlassian/jira/user/ApplicationUser;)Lcom/atlassian/jira/avatar/AvatarImpl;
at com.atlassian.servicedesk.internal.feature.customer.user.UserAvatarCreateService.createAndAssign(UserAvatarCreateService.scala:41)
at com.atlassian.servicedesk.internal.feature.customer.CustomerViewProfileService$$anonfun$updateProfile$2.apply(CustomerViewProfileService.scala:72)
at com.atlassian.servicedesk.internal.feature.customer.CustomerViewProfileService$$anonfun$updateProfile$2.apply(CustomerViewProfileService.scala:51)
at scalaz.$bslash$div$class.fold(Either.scala:40)
at scalaz.$bslash$div$minus.fold(Either.scala:283)
at com.atlassian.servicedesk.internal.feature.customer.CustomerViewProfileService.updateProfile(CustomerViewProfileService.scala:49)
at com.atlassian.servicedesk.internal.rest.UserResource.updateProfile(UserResource.scala:41)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
...