diff --git a/src/compas_fab/backends/pybullet/client.py b/src/compas_fab/backends/pybullet/client.py
index 348f21f27..38e6bf201 100644
--- a/src/compas_fab/backends/pybullet/client.py
+++ b/src/compas_fab/backends/pybullet/client.py
@@ -6,7 +6,6 @@
 import os
 import sys
 import tempfile
-from itertools import combinations
 
 import compas
 from compas.geometry import Frame
@@ -16,8 +15,6 @@
 from compas_robots.model import MeshDescriptor
 from compas_robots import ToolModel
 
-import compas_fab
-from compas_fab.backends import CollisionCheckInCollisionError
 from compas_fab.backends import CollisionCheckError
 from compas_fab.backends.interfaces.client import ClientInterface
 
@@ -503,8 +500,8 @@ def _check_collision(self, body_1_id, body_1_name, body_2_id, body_2_name, link_
         kwargs = {key: value for key, value in kwargs.items() if value is not None}
         pts = pybullet.getClosestPoints(**kwargs)
         if pts:
-            # LOG.warning("Collision between '{}' and '{}'".format(body_1_name, body_2_name))
-            raise CollisionCheckInCollisionError(body_1_name, body_2_name)
+            message = "Collision between '{}' and '{}'".format(body_1_name, body_2_name)
+            raise CollisionCheckError(message)
 
     # --------------------------------
     # Functions related to puids