diff --git a/owrx/dsp.py b/owrx/dsp.py
index 5dd59410..fb33fe8f 100644
--- a/owrx/dsp.py
+++ b/owrx/dsp.py
@@ -699,7 +699,7 @@ class DspManager(SdrSourceEventClient, ClientDemodulatorSecondaryDspEventClient)
             b = data.tobytes()
             # If we know it's not pickled, let us not unpickle
             if len(b) < 2 or b[0] != 0x80 or not 3 <= b[1] <= pickle.HIGHEST_PROTOCOL:
-                callback(b.decode("ascii"))
+                callback(b.decode("ascii", errors="replace"))
                 return
 
             io = BytesIO(b)
@@ -709,7 +709,7 @@ class DspManager(SdrSourceEventClient, ClientDemodulatorSecondaryDspEventClient)
             except EOFError:
                 pass
             except pickle.UnpicklingError:
-                callback(b.decode("ascii"))
+                callback(b.decode("ascii", errors="replace"))
 
         return unpickler