diff --git a/htdocs/core/class/hookmanager.class.php b/htdocs/core/class/hookmanager.class.php
index 64b67263335..1cbe01939ce 100644
--- a/htdocs/core/class/hookmanager.class.php
+++ b/htdocs/core/class/hookmanager.class.php
@@ -265,8 +265,14 @@ class HookManager
                     	//dol_syslog("Call method ".$method." of class ".get_class($actionclassinstance).", module=".$module.", hooktype=".$hooktype, LOG_DEBUG);
                     	$resaction = $actionclassinstance->$method($parameters, $object, $action, $this); // $object and $action can be changed by method ($object->id during creation for example or $action to go back to other action for example)
 
-                    	if (! empty($actionclassinstance->results) && is_array($actionclassinstance->results)) $this->resArray =array_merge($this->resArray, $actionclassinstance->results);
+                    	if (! empty($actionclassinstance->results) && is_array($actionclassinstance->results)) $this->resArray=array_merge($this->resArray, $actionclassinstance->results);
                     	if (! empty($actionclassinstance->resprints)) $this->resPrint.=$actionclassinstance->resprints;
+                    	if (is_numeric($resaction) && $resaction < 0)
+                    	{
+                    	    $error++;
+                    	    $this->error=$actionclassinstance->error; $this->errors=array_merge($this->errors, (array) $actionclassinstance->errors);
+                    	    dol_syslog("Error on hook module=".$module.", method ".$method.", class ".get_class($actionclassinstance).", hooktype=".$hooktype.(empty($this->error)?'':" ".$this->error).(empty($this->errors)?'':" ".join(",",$this->errors)), LOG_ERR);
+                    	}
                     	// TODO dead code to remove (do not enable this, but fix hook instead): result must not be a string but an int. you must use $actionclassinstance->resprints to return a string
                     	if (! is_array($resaction) && ! is_numeric($resaction))
                     	{