diff --git a/io_scene_fbx/export_fbx.py b/io_scene_fbx/export_fbx.py
index f417007286a33df8803ed04554eb19678284cf90..965941d9ddd3c6018d065b81a25b7d9b4ad0de01 100644
--- a/io_scene_fbx/export_fbx.py
+++ b/io_scene_fbx/export_fbx.py
@@ -347,6 +347,7 @@ def save_single(operator, scene, filepath="",
             self.blenObject = ob
             self.fbxGroupNames = []
             self.fbxParent = None  # set later on IF the parent is in the selection.
+            self.fbxArm = None
             if matrixWorld:
                 self.matrixWorld = global_matrix * matrixWorld
             else: