diff --git a/TTS/utils/audio.py b/TTS/utils/audio.py
index 45c061d2..f5fb1d7f 100644
--- a/TTS/utils/audio.py
+++ b/TTS/utils/audio.py
@@ -610,7 +610,7 @@ class AudioProcessor(object):
         y = self._istft(S_complex * angles)
         if not np.isfinite(y).all():
             print(" [!] Waveform is not finite everywhere. Skipping the GL.")
-            return np.array([0])
+            return np.array([0.0])
         for _ in range(self.griffin_lim_iters):
             angles = np.exp(1j * np.angle(self._stft(y)))
             y = self._istft(S_complex * angles)
diff --git a/tests/inference_tests/test_synthesize.py b/tests/inference_tests/test_synthesize.py
index 526f7dc8..635506ab 100644
--- a/tests/inference_tests/test_synthesize.py
+++ b/tests/inference_tests/test_synthesize.py
@@ -11,11 +11,10 @@ def test_synthesize():
     # single speaker model
     run_cli(f'tts --text "This is an example." --out_path "{output_path}"')
     run_cli(
-        "tts --model_name tts_models/en/ljspeech/speedy-speech-wn "
-        f'--text "This is an example." --out_path "{output_path}"'
+        "tts --model_name tts_models/en/ljspeech/glow-tts " f'--text "This is an example." --out_path "{output_path}"'
     )
     run_cli(
-        "tts --model_name tts_models/en/ljspeech/speedy-speech-wn  "
+        "tts --model_name tts_models/en/ljspeech/glow-tts  "
         "--vocoder_name vocoder_models/en/ljspeech/multiband-melgan "
         f'--text "This is an example." --out_path "{output_path}"'
     )