diff --git a/src/spikeinterface/core/waveform_tools.py b/src/spikeinterface/core/waveform_tools.py
index 58243ceea2..f9e39382df 100644
--- a/src/spikeinterface/core/waveform_tools.py
+++ b/src/spikeinterface/core/waveform_tools.py
@@ -696,6 +696,8 @@ def has_exceeding_spikes(recording, sorting):
         if len(spike_vector_seg) > 0:
             if spike_vector_seg["sample_index"][-1] > recording.get_num_samples(segment_index=segment_index) - 1:
                 return True
+            if spike_vector_seg["sample_index"][0] < 0:
+                return True
     return False
 
 
diff --git a/src/spikeinterface/curation/remove_excess_spikes.py b/src/spikeinterface/curation/remove_excess_spikes.py
index 5fb05a64a7..450b31e3d4 100644
--- a/src/spikeinterface/curation/remove_excess_spikes.py
+++ b/src/spikeinterface/curation/remove_excess_spikes.py
@@ -61,7 +61,8 @@ def _custom_cache_spike_vector(self) -> None:
         for segment_index in range(num_segments):
             spike_vector = parent_spike_vector[segments_bounds[segment_index] : segments_bounds[segment_index + 1]]
             end = np.searchsorted(spike_vector["sample_index"], self._num_samples[segment_index])
-            list_spike_vectors.append(spike_vector[:end])
+            start = np.searchsorted(spike_vector["sample_index"], 0)
+            list_spike_vectors.append(spike_vector[start:end])
 
         spike_vector = np.concatenate(list_spike_vectors)
         self._cached_spike_vector = spike_vector