1 files changed, 4 insertions, 0 deletions
diff --git a/libjava/jni.cc b/libjava/jni.cc
index 07ef7134540..d71b16d99ea 100644
--- a/libjava/jni.cc
+++ b/libjava/jni.cc
@@ -1750,6 +1750,10 @@ _Jv_JNI_NewWeakGlobalRef (JNIEnv *env, jobject obj)
 void JNICALL
 _Jv_JNI_DeleteWeakGlobalRef (JNIEnv *, jweak obj)
 {
+  // JDK compatibility.
+  if (obj == NULL)
+    return;
+
   using namespace gnu::gcj::runtime;
   JNIWeakRef *ref = reinterpret_cast<JNIWeakRef *> (obj);
   unmark_for_gc (ref, global_ref_table);