From 2fa0ae9349d9d76f9e748df20c953a9c770f7159 Mon Sep 17 00:00:00 2001
From: Erwin Coumans
 <erwincoumans@erwincoumans-macbookpro2.roam.corp.google.com>
Date: Mon, 29 Oct 2018 13:45:42 -0700
Subject: [PATCH] fix sprintf using nullptr string

---
 examples/Utils/b3BulletDefaultFileIO.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/examples/Utils/b3BulletDefaultFileIO.h b/examples/Utils/b3BulletDefaultFileIO.h
index aa1dc5ce6..b4cf20c4b 100644
--- a/examples/Utils/b3BulletDefaultFileIO.h
+++ b/examples/Utils/b3BulletDefaultFileIO.h
@@ -24,7 +24,11 @@ struct b3BulletDefaultFileIO : public CommonFileIOInterface
 		:CommonFileIOInterface(fileIOType, m_prefix),
 		m_numFileHandles(0)
 	{
-		sprintf(m_prefix,"%s", pathPrefix);
+		m_prefix[0] = 0;
+		if (pathPrefix)
+		{
+			sprintf(m_prefix,"%s", pathPrefix);
+		}
 		for (int i=0;i<B3_FILEIO_MAX_FILES;i++)
 		{
 			m_fileHandles[i]=0;