diff --git a/src/Exception/BehaviorImplementationRefusedException.php b/src/Exception/BehaviorImplementationRefusedException.php
new file mode 100644
index 0000000..6cf8f72
--- /dev/null
+++ b/src/Exception/BehaviorImplementationRefusedException.php
@@ -0,0 +1,11 @@
+<?php
+namespace Gbili\Exception;
+
+/**
+ * Use this in a getter whose property has not been set yet
+ */
+class BehaviorImplementationRefusedException
+extends \Gbili\Exception\Exception
+{
+
+}