diff --git a/models/behaviors/linkable.php b/models/behaviors/linkable.php
index 388456f..c530ea5 100644
--- a/models/behaviors/linkable.php
+++ b/models/behaviors/linkable.php
@@ -177,7 +177,8 @@ class LinkableBehavior extends ModelBehavior {
 							$options['alias'] = $linkAlias;
 							$options['table'] = $Link->getDataSource()->fullTableName($Link);
 							$options['conditions'][] = "{$referenceLink} = {$referenceKey}";
-						} else {
+						}
+						elseif (isset($association['foreignKey']) && $association['foreignKey']) {
 							$foreignKey = $primaryModel->escapeField($association['foreignKey']);
 							$primaryKey = $foreignModel->escapeField($foreignModel->primaryKey);
 
@@ -188,6 +189,10 @@ class LinkableBehavior extends ModelBehavior {
 							else
 								$options['conditions'][] = "{$foreignKey} = {$primaryKey}";
 						}
+						else {
+							// No Foreign Key... nothing we can do.
+							$options['conditions'] = array();
+						}
 
 						// The user may have specified conditions directly in the model
 						// for this join.  Make sure to adhere to those conditions.