diff --git a/media/libstagefright/NuCachedSource2.cpp b/media/libstagefright/NuCachedSource2.cpp
index c7b99b9..248b678 100644
--- a/media/libstagefright/NuCachedSource2.cpp
+++ b/media/libstagefright/NuCachedSource2.cpp
@@ -135,6 +135,10 @@
 void PageCache::copy(size_t from, void *data, size_t size) {
     LOGV("copy from %d size %d", from, size);
 
+    if (size == 0) {
+        return;
+    }
+
     CHECK_LE(from + size, mTotalSize);
 
     size_t offset = 0;