diff --git a/core/dbobject.class.php b/core/dbobject.class.php
index cb444e50b0..59049c7c24 100644
--- a/core/dbobject.class.php
+++ b/core/dbobject.class.php
@@ -2792,12 +2792,6 @@ abstract class DBObject implements iDisplay
 		$this->DoComputeValues();
 		$this->OnInsert();
 
-		if ($this->m_iKey < 0)
-		{
-			// This was a temporary "memory" key: discard it so that DBInsertSingleTable will not try to use it!
-			$this->m_iKey = null; 
-		}
-
 		// If not automatically computed, then check that the key is given by the caller
 		if (!MetaModel::IsAutoIncrementKey($sRootClass))
 		{
@@ -2814,6 +2808,12 @@ abstract class DBObject implements iDisplay
 			throw new CoreCannotSaveObjectException(array('issues' => $aIssues, 'class' => get_class($this), 'id' => $this->GetKey()));
 		}
 
+		if ($this->m_iKey < 0)
+		{
+			// This was a temporary "memory" key: discard it so that DBInsertSingleTable will not try to use it!
+			$this->m_iKey = null;
+		}
+
 		// Stop watches
 		$sState = $this->GetState();
 		if ($sState != '')