diff --git a/test/fuzzers/audio_processing_configs_fuzzer.cc b/test/fuzzers/audio_processing_configs_fuzzer.cc
index 52951819f5..4900c0f865 100644
--- a/test/fuzzers/audio_processing_configs_fuzzer.cc
+++ b/test/fuzzers/audio_processing_configs_fuzzer.cc
@@ -90,7 +90,9 @@ std::unique_ptr<AudioProcessing> CreateApm(test::FuzzDataHelper* fuzz_data,
       fuzz_data->ReadByteArray(kSizeOfConfigSegment - fuzz_data->BytesRead()));
 
   // Filter out incompatible settings that lead to CHECK failures.
-  if (use_aecm && use_aec) {
+  if ((use_aecm && use_aec) ||      // These settings cause CHECK failure.
+      (use_aecm && aec3 && use_ns)  // These settings trigger webrtc:9489.
+      ) {
     return nullptr;
   }
 
diff --git a/test/fuzzers/audio_processing_fuzzer_helper.cc b/test/fuzzers/audio_processing_fuzzer_helper.cc
index 0fa1bad775..a1e25b5266 100644
--- a/test/fuzzers/audio_processing_fuzzer_helper.cc
+++ b/test/fuzzers/audio_processing_fuzzer_helper.cc
@@ -80,7 +80,7 @@ void FuzzAudioProcessing(test::FuzzDataHelper* fuzz_data,
     const auto output_rate =
         static_cast<size_t>(fuzz_data->SelectOneOf(rate_kinds));
 
-    const bool num_channels = fuzz_data->ReadOrDefaultValue(true) ? 2 : 1;
+    const int num_channels = fuzz_data->ReadOrDefaultValue(true) ? 2 : 1;
     const uint8_t stream_delay = fuzz_data->ReadOrDefaultValue<uint8_t>(0);
 
     // API call needed for AEC-2 and AEC-m to run.
@@ -121,6 +121,7 @@ void FuzzAudioProcessing(test::FuzzDataHelper* fuzz_data,
     // codeways.
     static_cast<void>(apm->GetStatistics());
     static_cast<void>(apm->GetStatistics(true));
+    static_cast<void>(apm->UpdateHistogramsOnCallEnd());
 
     RTC_DCHECK_NE(apm_return_code, AudioProcessing::kBadDataLengthError);
   }