From f2a23c892456d9337ee2cb531653f8ade188ce7c Mon Sep 17 00:00:00 2001
From: "kr.angelov" <kr.angelov@gmail.com>
Date: Tue, 9 Dec 2014 12:31:36 +0000
Subject: [PATCH] make sure that the app doesn't crash even if nonExist is used
 somewhere in the grammars

---
 .../org/grammaticalframework/ui/android/Translator.java   | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/ui/android/src/org/grammaticalframework/ui/android/Translator.java b/src/ui/android/src/org/grammaticalframework/ui/android/Translator.java
index bd47f2cc7..fe318b49a 100644
--- a/src/ui/android/src/org/grammaticalframework/ui/android/Translator.java
+++ b/src/ui/android/src/org/grammaticalframework/ui/android/Translator.java
@@ -312,13 +312,19 @@ public class Translator {
         } catch (ParseError e) {
         	output = translateByLookup(input);
         }
+        
+        if (output == null)
+        	output = "% ";     // make sure that we return something
 
         return new Pair<String,List<ExprProb>>(output, exprs);
     }
 
     public String linearize(Expr expr) {
     	Concr targetLang = getTargetConcr();
-    	return targetLang.linearize(expr);
+    	String s = targetLang.linearize(expr);
+    	if (s == null)
+    		s = "% ";     // make sure that we return something
+    	return s;
     }
 
     public Object[] bracketedLinearize(Expr expr) {