diff --git a/libSBRdec/src/env_extr.cpp b/libSBRdec/src/env_extr.cpp
index c72a7b6..5b7a0b1 100644
--- a/libSBRdec/src/env_extr.cpp
+++ b/libSBRdec/src/env_extr.cpp
@@ -1152,6 +1152,10 @@ static int generateFixFixOnly(FRAME_INFO *hSbrFrameInfo, int tranPosInternal,
   int nEnv, i, tranIdx;
   const int *pTable;
 
+  if (tranPosInternal >= numberTimeSlots) {
+    return 0;
+  }
+
   switch (numberTimeSlots) {
     case 8:
       pTable = FDK_sbrDecoder_envelopeTable_8[tranPosInternal];