From 9f679ee28acf5dd6eb92ed2e32dedfb4283ad8ad Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Adri=C3=A1n=20Medra=C3=B1o=20Calvo?=
 <adrian@medranocalvo.com>
Date: Tue, 11 Sep 2018 12:00:00 +0000
Subject: NULL check to prevent segfault

---
 generic/tkbltGrElemLine.C | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/generic/tkbltGrElemLine.C b/generic/tkbltGrElemLine.C
index ac2b340..988c1de 100644
--- a/generic/tkbltGrElemLine.C
+++ b/generic/tkbltGrElemLine.C
@@ -1728,7 +1728,7 @@ void LineElement::mapErrorBars(LineStyle **styleMap)
       if ((isfinite(x)) && (isfinite(y))) {
 	double high;
 	double low;
-	if (ops->xError->nValues() > 0) {
+	if (ops->xError && ops->xError->nValues() > 0) {
 	  high = x + ops->xError->values_[ii];
 	  low = x - ops->xError->values_[ii];
 	} 
@@ -1795,7 +1795,7 @@ void LineElement::mapErrorBars(LineStyle **styleMap)
       if ((isfinite(x)) && (isfinite(y))) {
 	double high;
 	double low;
- 	if (ops->yError->nValues() > 0) {
+	if (ops->yError && ops->yError->nValues() > 0) {
  	  high = y + ops->yError->values_[ii];
  	  low = y - ops->yError->values_[ii];
  	} 
-- 
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