diff --git a/src/binarystreamreader.cpp b/src/binarystreamreader.cpp
--- a/src/binarystreamreader.cpp
+++ b/src/binarystreamreader.cpp
@@ -122,6 +122,16 @@ void BinaryStreamReader::onDataReady()
     // a package is a set of channel data like {CHAN0_SAMPLE, CHAN1_SAMPLE...}
     int packageSize = sampleSize * _numOfChannels;
     int bytesAvailable = _device->bytesAvailable();
+
+    if (bytesAvailable > 0 && skipByteRequested)
+    {
+        _device->read(1);
+        skipByteRequested = false;
+        bytesAvailable--;
+    }
+
+    if (bytesAvailable < packageSize) return;
+
     int numOfPackagesToRead =
         (bytesAvailable - (bytesAvailable % packageSize)) / packageSize;
 
@@ -132,15 +142,6 @@ void BinaryStreamReader::onDataReady()
         return;
     }
 
-    if (bytesAvailable > 0 && skipByteRequested)
-    {
-        _device->read(1);
-        skipByteRequested = false;
-        bytesAvailable--;
-    }
-
-    if (bytesAvailable < packageSize) return;
-
     double* channelSamples = new double[numOfPackagesToRead*_numOfChannels];
 
     for (int i = 0; i < numOfPackagesToRead; i++)