diff --git a/assignment-client/src/audio/AudioMixerClientData.cpp b/assignment-client/src/audio/AudioMixerClientData.cpp
index 2b4043dee4..e0a49b2b1b 100644
--- a/assignment-client/src/audio/AudioMixerClientData.cpp
+++ b/assignment-client/src/audio/AudioMixerClientData.cpp
@@ -151,7 +151,7 @@ AudioMixerClientData::IgnoreZone& AudioMixerClientData::getIgnoreZone(unsigned i
             Q_UNUSED(oldFrame);
 
             // check the precondition
-            assert(frame == (oldFrame + 1));
+            assert(oldFrame == 0 || frame == (oldFrame + 1));
         }
     }