diff --git a/proprietary/wvm/WVMMediaSource.cpp b/proprietary/wvm/WVMMediaSource.cpp
index fe69691b..9a59250f 100644
--- a/proprietary/wvm/WVMMediaSource.cpp
+++ b/proprietary/wvm/WVMMediaSource.cpp
@@ -477,6 +477,11 @@ void WVMMediaSource::DecryptCallback(WVEsSelector esType, void* input, void* out
     DecryptContext &context = source->getDecryptContext();
     uint32_t copied = length;
 
+    if (!context.mMediaBuf->data()) {
+        ALOGE("WVMMediaSource::DecryptCallback - no media buffer!");
+        return;
+    }
+
     if (clientContext->getCryptoPluginMode()) {
         // just determine crypto unit boundaries
         if (key) {