diff --git a/src/images/SkScaledBitmapSampler.cpp b/src/images/SkScaledBitmapSampler.cpp
index fe425d5..788bcd4 100644
--- a/src/images/SkScaledBitmapSampler.cpp
+++ b/src/images/SkScaledBitmapSampler.cpp
@@ -763,7 +763,9 @@
     // of the destination bitmap's pixels, which is used to calculate the destination row
     // each time this function is called.
     const int dstY = srcYMinusY0 / fDY;
-    SkASSERT(dstY < fScaledHeight);
+    if (dstY >= fScaledHeight) {
+        return false;
+    }
     char* dstRow = fDstRow + dstY * fDstRowBytes;
     return fRowProc(dstRow, src + fX0 * fSrcPixelSize, fScaledWidth,
                     fDX * fSrcPixelSize, dstY, fCTable);