From cb6d2f5611c35369bd4e187a795dbfb77e9470ba Mon Sep 17 00:00:00 2001
From: jgould <jgould@broadinstitute.org>
Date: Tue, 2 Aug 2016 20:52:35 -0400
Subject: [PATCH] field check

---
 src/io/maf_file_reader.js | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/io/maf_file_reader.js b/src/io/maf_file_reader.js
index 4d8f444..d625cc9 100644
--- a/src/io/maf_file_reader.js
+++ b/src/io/maf_file_reader.js
@@ -135,6 +135,9 @@ morpheus.MafFileReader.prototype = {
 				lc: true,
 				remove: true
 			});
+		if (sampleField == null) {
+			throw new Error('Sample id column not found.');
+		}
 		var sampleColumnName = sampleField.name;
 		var sampleIdColumnIndex = sampleField.index;
 		var tumorFractionField = morpheus.MafFileReader.getField(['ccf_hat',
@@ -157,6 +160,9 @@ morpheus.MafFileReader.prototype = {
 		var proteinChangeColumn = fieldNameToIndex['Protein_Change'
 		.toLowerCase()];
 		var geneSymbolColumn = fieldNameToIndex['Hugo_Symbol'.toLowerCase()];
+		if (geneSymbolColumn == null) {
+			throw new Error('Gene symbol column not found.');
+		}
 		var variantColumnIndex = headerToIndex['Variant_Classification'
 		.toLowerCase()];
 		if (variantColumnIndex === undefined) {
-- 
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