diff --git a/model/DataObject.php b/model/DataObject.php
index 8b8cb300a..ca972f6b2 100644
--- a/model/DataObject.php
+++ b/model/DataObject.php
@@ -1320,7 +1320,7 @@ class DataObject extends ViewableData implements DataObjectInterface, i18nEntity
 		
 		$result = new HasManyList($componentClass, $joinField);
 		if($this->model) $result->setModel($this->model);
-		if($this->ID) $result->setForeignID($this->ID);
+		$result->setForeignID($this->ID);
 
 		$result = $result->where($filter)->limit($limit)->sort($sort);
 		if($join) $result = $result->join($join);
@@ -1412,7 +1412,7 @@ class DataObject extends ViewableData implements DataObjectInterface, i18nEntity
 
 		// If this is called on a singleton, then we return an 'orphaned relation' that can have the
 		// foreignID set elsewhere.
-		if($this->ID) $result->setForeignID($this->ID);
+		$result->setForeignID($this->ID);
 			
 		return $result->where($filter)->sort($sort)->limit($limit);
 	}
diff --git a/model/HasManyList.php b/model/HasManyList.php
index 5be23c927..3d38bb52e 100644
--- a/model/HasManyList.php
+++ b/model/HasManyList.php
@@ -26,7 +26,7 @@ class HasManyList extends RelationList {
 		if(is_array($this->foreignID)) {
 			return "\"$this->foreignKey\" IN ('" . 
 				implode("', '", array_map('Convert::raw2sql', $this->foreignID)) . "')";
-		} else if($this->foreignID){
+		} else if($this->foreignID !== null){
 			return "\"$this->foreignKey\" = '" . 
 				Convert::raw2sql($this->foreignID) . "'";
 		}
diff --git a/model/ManyManyList.php b/model/ManyManyList.php
index 76e4db2b8..5ddb2b053 100644
--- a/model/ManyManyList.php
+++ b/model/ManyManyList.php
@@ -73,7 +73,7 @@ class ManyManyList extends RelationList {
 		if(is_array($this->foreignID)) {
 			return "\"$this->joinTable\".\"$this->foreignKey\" IN ('" . 
 				implode("', '", array_map('Convert::raw2sql', $this->foreignID)) . "')";
-		} else if($this->foreignID){
+		} else if($this->foreignID !== null){
 			return "\"$this->joinTable\".\"$this->foreignKey\" = '" . 
 				Convert::raw2sql($this->foreignID) . "'";
 		}
diff --git a/security/Member.php b/security/Member.php
index 5203e28ab..b78eefb53 100644
--- a/security/Member.php
+++ b/security/Member.php
@@ -946,7 +946,7 @@ class Member extends DataObject {
 	 */
 	public function Groups() {
 		$groups = new Member_GroupSet('Group', 'Group_Members', 'GroupID', 'MemberID');
-		if($this->ID) $groups->setForeignID($this->ID);
+		$groups->setForeignID($this->ID);
 		
 		$this->extend('updateGroups', $groups);
 
diff --git a/tests/model/HasManyListTest.php b/tests/model/HasManyListTest.php
new file mode 100644
index 000000000..f9394d4de
--- /dev/null
+++ b/tests/model/HasManyListTest.php
@@ -0,0 +1,20 @@
+<?php
+
+class HasManyListTest extends SapphireTest {
+	
+	// Borrow the model from DataObjectTest
+	public static $fixture_file = 'DataObjectTest.yml';
+
+	protected $extraDataObjects = array(
+		'DataObjectTest_Team',
+		'DataObjectTest_SubTeam',
+		'DataObjectTest_Player',
+	);
+	
+	public function testRelationshipEmptyOnNewRecords() {
+		// Relies on the fact that (unrelated) comments exist in the fixture file already
+		$newTeam = new DataObjectTest_Team(); // has_many Comments
+		$this->assertEquals(array(), $newTeam->Comments()->column('ID'));
+	}
+
+}
\ No newline at end of file
diff --git a/tests/model/ManyManyListTest.php b/tests/model/ManyManyListTest.php
index f9240eb02..158f095f7 100644
--- a/tests/model/ManyManyListTest.php
+++ b/tests/model/ManyManyListTest.php
@@ -15,6 +15,12 @@ class ManyManyListTest extends SapphireTest {
 		$list = ManyManyList::create('DataObjectTest_Team','DataObjectTest_Team_Players', 'DataObjectTest_TeamID', 'DataObjectTest_PlayerID');
 		$this->assertEquals(2, $list->count());
 	}
+
+	public function testRelationshipEmptyOnNewRecords() {
+		// Relies on the fact that (unrelated) teams exist in the fixture file already
+		$newPlayer = new DataObjectTest_Player(); // many_many Teams
+		$this->assertEquals(array(), $newPlayer->Teams()->column('ID'));
+	}
 	
 	public function testAddingSingleDataObjectByReference() {
 		$player1 = $this->objFromFixture('DataObjectTest_Player', 'player1');