If you will get a stack trace like:
Fatal error: Call to a member function GetHash() on a non-object in /tmp/gitphp-tuleap/smarty/templates_c/%%D9^D98^D9848B98%%blob.tpl.php on line 23
Call Stack
# Time Memory Function Location
1 0.0001 666376 {main}( ) ../index.php:0
2 0.0429 7450496 GitPlugin->process( ) ../index.php:39
3 0.0561 8863768 PluginController->process( ) ../gitPlugin.class.php:643
4 0.0613 9043592 PluginController->executeViews( ) ../PluginController.class.php:236
5 0.1069 10641720 PluginViews->display( ) ../PluginController.class.php:185
6 0.1069 10642160 call_user_func_array ( ) ../PluginViews.class.php:60
7 0.1069 10642408 GitViews->view( ) ../PluginViews.class.php:60
8 0.1071 10648896 GitViews_ShowRepo->display( ) ../GitViews.class.php:234
9 0.1074 10671584 GitViews_ShowRepo_Content->display( ) ../ShowRepo.class.php:108
10 0.1206 10892368 GitViews_ShowRepo_Content->displayContent( ) ../Content.class.php:112
11 0.1207 10892416 GitViews_ShowRepo_Content->displayRepositoryContent( ) ../Content.class.php:121
12 0.1207 10892576 GitViews_GitPhpViewer->getContent( ) ../Content.class.php:144
13 0.1207 10934224 GitViews_GitPhpViewer->getView( ) ../GitPhpViewer.class.php:40
14 0.1209 10936184 include( '/usr/share/gitphp-tuleap/index.php' ) ../GitPhpViewer.class.php:65
15 0.1301 11438904 GitPHP_ControllerBase->Render( ) ../index.php:157
16 0.1365 11638328 Smarty->display( ) ../ControllerBase.class.php:346
17 0.1365 11638424 Smarty->fetch( ) ../Smarty.class.php:1106
18 0.1367 11642328 include( '/tmp/gitphp-tuleap/smarty/templates_c/%%D9^D98^D9848B98%%blob.tpl.php' ) ../Smarty.class.php:1256

Reproduction steps:
1. Create a a new Git repo
2. Commit something in a branch that is not master and publish it
3. Try the blob of a file of your commit