From dbc8a6f5792638be77cdbeb014a8f797e68a1178 Mon Sep 17 00:00:00 2001
From: "kr.angelov" <kr.angelov@gmail.com>
Date: Thu, 10 Apr 2014 16:43:40 +0000
Subject: [PATCH] bugfix in the Java binding

---
 src/runtime/java/jpgf.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/runtime/java/jpgf.c b/src/runtime/java/jpgf.c
index 7de1d9516..6efba6808 100644
--- a/src/runtime/java/jpgf.c
+++ b/src/runtime/java/jpgf.c
@@ -680,7 +680,9 @@ jpgf_literal_callback_fn(PgfLiteralCallback* self,
 
 	jstring jsentence = gu2j_string(env, sentence);
 	jobject result = (*env)->CallObjectMethod(env, callback->jcallback, callback->match_methodId, lin_idx, jsentence, *poffset);
-	
+	if (result == NULL)
+		return NULL;
+
 	jclass result_class = (*env)->GetObjectClass(env, result);
 	
 	jfieldID epId = (*env)->GetFieldID(env, result_class, "ep", "Lorg/grammaticalframework/pgf/ExprProb;");