fix span error

Author: dtam

guardrails/telemetry/guard_tracing.py

@@ -145,8 +145,17 @@ def trace_stream_guard(
             res = next(result)  # type: ignore
             # FIXME: This should only be called once;
             # Accumulate the validated output and call at the end
-            add_guard_attributes(guard_span, history, res)
-            add_user_attributes(guard_span)
+            if not guard_span.is_recording():
+                # Assuming you have a tracer instance
+                tracer = get_tracer(__name__)
+                # Create a new span and link it to the previous span
+                with tracer.start_as_current_span(
+                    "new_guard_span",  # type: ignore
+                    links=[Link(guard_span.get_span_context())],
+                ) as new_span:
+                    guard_span = new_span
+                    add_guard_attributes(guard_span, history, res)
+                    add_user_attributes(guard_span)
             yield res
         except StopIteration:
             next_exists = False