This is a related to QB-2445 issue (moved out of comments)

After a successful proof build on a "Local Change" tab one can view listed changeset of this proof build including changed submodule files.
If to click on a changed repository file, one can see it's differences.
But an error occures if to click on modified (not added or deleted) submodule files:

Error Detail
Message: Failed to run command: git show dba7c927af47b9e4fd1d7b634d511a109fd771a6:lib/gems/rake-delphi/lib/rake/delphi/dcc32.rb
Command return code: 128
Command error output: fatal: Path 'lib/gems/rake-delphi/lib/rake/delphi/dcc32.rb' exists on disk, but not in 'dba7c927af47b9e4fd1d7b634d511a109fd771a6'.

Root cause:

com.pmease.quickbuild.QuickbuildException: Failed to run command: git show dba7c927af47b9e4fd1d7b634d511a109fd771a6:lib/gems/rake-delphi/lib/rake/delphi/dcc32.rb
Command return code: 128
Command error output: fatal: Path 'lib/gems/rake-delphi/lib/rake/delphi/dcc32.rb' exists on disk, but not in 'dba7c927af47b9e4fd1d7b634d511a109fd771a6'.
at com.pmease.quickbuild.execution.Commandline$ExecuteResult.buildException(Commandline.java:485)
at com.pmease.quickbuild.execution.Commandline$ExecuteResult.checkReturnCode(Commandline.java:500)
at com.pmease.quickbuild.plugin.scm.helper.ScmCli.run(ScmCli.java:90)
at com.pmease.quickbuild.plugin.scm.helper.ScmCli.run(ScmCli.java:79)
at com.pmease.quickbuild.plugin.scm.helper.ScmCli.run(ScmCli.java:71)
at com.pmease.quickbuild.plugin.scm.git.GitCli.show(GitCli.java:377)
at com.pmease.quickbuild.plugin.scm.git.GitSourceViewSupport.readSourceByRevision(GitSourceViewSupport.java:57)
at com.pmease.quickbuild.plugin.scm.git.GitSourceViewSupport.readSourceByRevision(GitSourceViewSupport.java:19)
at com.pmease.quickbuild.repositorysupport.WorkingDirLocator$SourceViewJob.execute(WorkingDirLocator.java:73)
at com.pmease.quickbuild.grid.NodeJobExecuteJob.execute(NodeJobExecuteJob.java:25)
at com.pmease.quickbuild.grid.GridJob.run(GridJob.java:106)
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecuto