diff --git a/htdocs/core/class/html.form.class.php b/htdocs/core/class/html.form.class.php
index 132c924d107bb..035d922e0c18b 100644
--- a/htdocs/core/class/html.form.class.php
+++ b/htdocs/core/class/html.form.class.php
@@ -6754,8 +6754,11 @@ function showrefnav($object,$paramid,$morehtml='',$shownav=1,$fieldid='rowid',$f
 			// Special case for project/task page
 			if ($paramid == 'project_ref')
 			{
-				$navurl = preg_replace('/\/tasks\/(task|contact|time|note|document)\.php/','/tasks.php',$navurl);
-				$paramid='ref';
+			    if (preg_match('/\/tasks\/(task|contact|note|document)\.php/', $navurl))     // TODO Remove this when nav with project_ref on task pages are ok
+			    {
+				    $navurl = preg_replace('/\/tasks\/(task|contact|time|note|document)\.php/', '/tasks.php', $navurl);
+    				$paramid='ref';
+			    }
 			}
 
 			// accesskey is for Windows or Linux:  ALT + key for chrome, ALT + SHIFT + KEY for firefox
diff --git a/htdocs/langs/en_US/projects.lang b/htdocs/langs/en_US/projects.lang
index 178cb4092d962..e2d6d87838c0d 100644
--- a/htdocs/langs/en_US/projects.lang
+++ b/htdocs/langs/en_US/projects.lang
@@ -235,3 +235,4 @@ RecordsClosed=%s project(s) closed
 SendProjectRef=Information project %s
 ModuleSalaryToDefineHourlyRateMustBeEnabled=Module 'Salaries' must be enabled to define employee hourly rate to have time spent valorized
 NewTaskRefSuggested=Task ref already used, a new task ref is required
+TimeSpentInvoiced=Time spent billed
\ No newline at end of file