diff --git a/lib/Cake/TestSuite/Fixture/CakeTestFixture.php b/lib/Cake/TestSuite/Fixture/CakeTestFixture.php
index 1fa2f246869..ca8baa9b3dc 100644
--- a/lib/Cake/TestSuite/Fixture/CakeTestFixture.php
+++ b/lib/Cake/TestSuite/Fixture/CakeTestFixture.php
@@ -283,7 +283,11 @@ public function insert($db) {
 				$nested = $db->useNestedTransactions;
 				$db->useNestedTransactions = false;
 				$result = $db->insertMulti($this->table, $fields, $values);
-				if ($this->primaryKey && in_array($this->fields[$this->primaryKey]['type'], array('integer', 'biginteger'))) {
+				if (
+					$this->primaryKey &&
+					isset($this->fields[$this->primaryKey]['type']) &&
+					in_array($this->fields[$this->primaryKey]['type'], array('integer', 'biginteger'))
+				) {
 					$db->resetSequence($this->table, $this->primaryKey);
 				}
 				$db->useNestedTransactions = $nested;