Fix spectrogram issue

app.py

@@ -94,7 +94,9 @@ def enhance(filepath, model_name):
             out = librosa.resample(out, orig_sr=16000, target_sr=orig_sr)
 
         # Normalize
-        out = out / np.max(np.abs(out)) * 0.85
+        peak = np.max(np.abs(out))
+        if peak > 1e-5:
+            out = out / peak * 0.85
 
         # write file
         sf.write("enhanced.wav", out, orig_sr)