NEW If error is reported during migration process, you can ignore it to

avoid to be locked.

htdocs/install/inc.php

@@ -420,7 +420,7 @@ function pHeader($subtitle,$next,$action='set',$param='',$forcejqueryurl='')
 /**
  * Print HTML footer of install pages
  *
- * @param 	integer	$nonext				1=No button "Next step", 2=Show button but disabled
+ * @param 	integer	$nonext				1=No button "Next step", 2=Show button but disabled with a link to enable
  * @param	string	$setuplang			Language code
  * @param	string	$jscheckfunction	Add a javascript check function
  * @param	integer	$withpleasewait		Add also please wait tags
@@ -439,7 +439,13 @@ function pFooter($nonext=0,$setuplang='',$jscheckfunction='', $withpleasewait=0)
 
     if (! $nonext || ($nonext == '2'))
     {
-        print '<div class="nextbutton" id="nextbutton"><input type="submit" '.($nonext == '2' ? 'disabled="disabled" title="DisabledBecauseOfErrorAddParamignoreerrors"':'').'value="'.$langs->trans("NextStep").' ->"';
+        print '<div class="nextbutton" id="nextbutton">';
+        if ($nonext == '2')
+		{
+			print $langs->trans("ErrorFoundDuringMigration", $_SERVER["REQUEST_URI"].'&ignoreerrors=1').'<br><br>';	
+		}
+        
+        print '<input type="submit" '.($nonext == '2' ? 'disabled="disabled" ':'').'value="'.$langs->trans("NextStep").' ->"';
         if ($jscheckfunction) print ' onClick="return '.$jscheckfunction.'();"';
         print '></div>';
         if ($withpleasewait) print '<div style="visibility: hidden;" class="pleasewait" id="pleasewait"><br>'.$langs->trans("NextStepMightLastALongTime").'<br><br><div class="blinkwait">'.$langs->trans("PleaseBePatient").'</div></div>';

htdocs/install/upgrade.php

 <?php
 /* Copyright (C) 2004      Rodolphe Quiedeville <rodolphe@quiedeville.org>
- * Copyright (C) 2004-2010 Laurent Destailleur  <eldy@users.sourceforge.net>
+ * Copyright (C) 2004-2016 Laurent Destailleur  <eldy@users.sourceforge.net>
  * Copyright (C) 2005-2010 Regis Houssin        <regis.houssin@capnetworks.com>
  * Copyright (C) 2015      Raphaël Doursenaud   <rdoursenaud@gpcsolutions.fr>
  *

htdocs/langs/en_US/install.lang

@@ -205,3 +205,4 @@ MigrationEvents=Migration of events to add event owner into assignement table
 MigrationReloadModule=Reload module %s
 ShowNotAvailableOptions=Show not available options
 HideNotAvailableOptions=Hide not available options
+ErrorFoundDuringMigration=Error were reported during migration process so next step is not available. To ignore errors, you can <a href="%s">click here</a>, but application or some features may not work correctly until fixed.
\ No newline at end of file