diff --git a/src/guidellm/benchmark/aggregator.py b/src/guidellm/benchmark/aggregator.py
index 9db93a12..e965c482 100644
--- a/src/guidellm/benchmark/aggregator.py
+++ b/src/guidellm/benchmark/aggregator.py
@@ -441,7 +441,7 @@ def __call__(
 
     def compile(
         self, state: AggregatorState, scheduler_state: SchedulerState
-    ) -> dict[Literal["scheduler_stats"], BenchmarkSchedulerStats]:
+    ) -> dict[Literal["run_stats"], BenchmarkSchedulerStats]:
         """
         Compile scheduler timing metrics into benchmark statistics.
 
@@ -473,7 +473,7 @@ def compile(
                     key="worker_resolve_time", type_="avg", default=0.0
                 ),
                 worker_resolve_end_delay_avg=state.get_metric(
-                    key="worker_resolve_end_delay", type_="avg"
+                    key="worker_resolve_end_delay", type_="avg", default=0.0
                 ),
                 finalized_delay_avg=state.get_metric(
                     key="finalized_delay", type_="avg", default=0.0
diff --git a/src/guidellm/benchmark/profile.py b/src/guidellm/benchmark/profile.py
index 042179ba..d2f9d70c 100644
--- a/src/guidellm/benchmark/profile.py
+++ b/src/guidellm/benchmark/profile.py
@@ -680,6 +680,8 @@ def next_strategy(
             self.throughput_rate = (
                 prev_benchmark.metrics.requests_per_second.successful.mean
             )
+            if self.synchronous_rate <= 0 and self.throughput_rate <= 0:
+                raise RuntimeError("Invalid rates in sweep; aborting. Were there any successful requests?")
             self.measured_rates = list(
                 np.linspace(
                     self.synchronous_rate,
@@ -698,7 +700,6 @@ def next_strategy(
                 if strat.type_ == self.strategy_type
             ]
         )
-
         if self.strategy_type == "constant":
             return AsyncConstantStrategy(
                 rate=self.measured_rates[next_rate_index],