java.lang.NullPointerException
   at org.netbeans.libs.git.GitBranch.getId(GitBranch.java:102)
   at org.netbeans.modules.git.ui.push.PushMapping$PushBranchMapping.getRemoteRepositoryBranchHeadId(PushMapping.java:128)
   at org.netbeans.modules.git.ui.push.PushAction$1.getOutgoingRevisions(PushAction.java:194)
   at org.netbeans.modules.git.ui.push.PushAction$1.beforePush(PushAction.java:172)
   at org.netbeans.modules.git.ui.push.PushAction$1.perform(PushAction.java:125)
   at org.netbeans.modules.git.client.GitProgressSupport.performIntern(GitProgressSupport.java:102)
   at org.netbeans.modules.git.client.GitProgressSupport.run(GitProgressSupport.java:95)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1452)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2032)