diff --git a/src/spikeinterface/sortingcomponents/motion_interpolation.py b/src/spikeinterface/sortingcomponents/motion_interpolation.py
index a81212897c..93a8ce62c8 100644
--- a/src/spikeinterface/sortingcomponents/motion_interpolation.py
+++ b/src/spikeinterface/sortingcomponents/motion_interpolation.py
@@ -386,13 +386,18 @@ def get_traces(self, start_frame, end_frame, channel_indices):
                 "time_vector for InterpolateMotionRecording do not work because temporal_bins start from 0"
             )
             # times = np.asarray(self.time_vector[start_frame:end_frame])
-        else:
-            times = np.arange((end_frame or self.get_num_samples()) - (start_frame or 0), dtype="float64")
-            times /= self.sampling_frequency
-            t0 = start_frame / self.sampling_frequency
-            # if self.t_start is not None:
-            #     t0 = t0 + self.t_start
-            times += t0
+
+        if start_frame is None:
+            start_frame = 0
+        if end_frame is None:
+            end_frame = self.get_num_samples()
+
+        times = np.arange(end_frame - start_frame, dtype="float64")
+        times /= self.sampling_frequency
+        t0 = start_frame / self.sampling_frequency
+        # if self.t_start is not None:
+        #     t0 = t0 + self.t_start
+        times += t0
 
         traces = self.parent_recording_segment.get_traces(start_frame, end_frame, channel_indices=slice(None))