diff --git a/io_scene_fbx/import_fbx.py b/io_scene_fbx/import_fbx.py
index 6196e19c8..0ac67a289 100644
--- a/io_scene_fbx/import_fbx.py
+++ b/io_scene_fbx/import_fbx.py
@@ -1931,7 +1931,10 @@ def blen_read_shapes(fbx_tmpl, fbx_data, objects, me, scene):
     # will be clamped, and we'll print a warning message to the console.
     shape_key_values_in_range = True
     bc_uuid_to_keyblocks = {}
-    for bc_uuid, fbx_sdata, fbx_bcdata in fbx_data:
+    for k, v in fbx_data.items():
+        bc_uuid = k[0]
+        fbx_sdata, fbx_bcdata = v
+
         elem_name_utf8 = elem_name_ensure_class(fbx_sdata, b'Geometry')
         indices = elem_prop_first(elem_find_first(fbx_sdata, b'Indexes'))
         dvcos = elem_prop_first(elem_find_first(fbx_sdata, b'Vertices'))
@@ -3506,11 +3509,12 @@ def load(operator, context, filepath="",
                                 node = fbx_helper_nodes[o_uuid]
                                 if node:
                                     objects.append(node)
-                            shapes_list = []
-                            mesh_to_shapes[bl_mdata] = (objects, shapes_list)
+                            shapes = {}
+                            mesh_to_shapes[bl_mdata] = (objects, shapes)
                         else:
-                            shapes_list = mesh_to_shapes[bl_mdata][1]
-                        shapes_list.append((bc_uuid, fbx_sdata, fbx_bcdata))
+                            shapes = mesh_to_shapes[bl_mdata][1]
+                        # Dict to avoid duplicates
+                        shapes[(bc_uuid, id(fbx_sdata), id(fbx_bcdata))] = (fbx_sdata, fbx_bcdata)
                     # BlendShape deformers are only here to connect BlendShapeChannels to meshes, nothing else to do.
 
         # Iterate through each mesh and create its shape keys