diff --git a/media/ndk/NdkMediaFormat.cpp b/media/ndk/NdkMediaFormat.cpp
index 249c76e..503f726 100644
--- a/media/ndk/NdkMediaFormat.cpp
+++ b/media/ndk/NdkMediaFormat.cpp
@@ -59,6 +59,9 @@
 
 EXPORT
 media_status_t AMediaFormat_copy(AMediaFormat *to, AMediaFormat *from) {
+    if (!to || !from) {
+        return AMEDIA_ERROR_INVALID_PARAMETER;
+    }
     to->mFormat->clear();
     to->mFormat->extend(from->mFormat);
     return AMEDIA_OK;