diff --git a/media/libstagefright/codecs/aacenc/src/adj_thr.c b/media/libstagefright/codecs/aacenc/src/adj_thr.c
index a8ab809..54fb19d 100644
--- a/media/libstagefright/codecs/aacenc/src/adj_thr.c
+++ b/media/libstagefright/codecs/aacenc/src/adj_thr.c
@@ -465,7 +465,7 @@
         deltaSfbPe = *psfbPeFactors * deltaPe;
 
 		/* thr3(n) = thr2(n)*2^deltaSfbPe/b(n) */
-        if (*psfbNActiveLines > 0) {
+        if (*psfbNActiveLines > 0 && (normFactor* (*psfbNActiveLines)) != 0) {
           /* new threshold */
           Word32 thrFactor;
           sfbEn  = psyOutChan->sfbEnergy[sfbGrp+sfb];