diff --git a/python/fusion_engine_client/parsers/mixed_log_reader.py b/python/fusion_engine_client/parsers/mixed_log_reader.py
index f6341f26..700117fa 100644
--- a/python/fusion_engine_client/parsers/mixed_log_reader.py
+++ b/python/fusion_engine_client/parsers/mixed_log_reader.py
@@ -591,6 +591,8 @@ def filter_in_place(self, key, clear_existing: Union[bool, str] = False,
         if self.index is not None:
             if len(self.index) == 0:
                 self.next_index_elem = 0
+            elif prev_offset_bytes < 0:
+                self.next_index_elem = 0
             else:
                 idx = np.argmax(self.index.offset > prev_offset_bytes)
                 if idx == 0 and self.index.offset[0] <= prev_offset_bytes: