From 54188c8b9e5fdaa5056723654184f460812952d4 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <slouken@libsdl.org>
Date: Sat, 3 Dec 2016 09:59:43 -0800
Subject: [PATCH] Fixed crash at startup

---
 src/events/SDL_mouse.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/src/events/SDL_mouse.c b/src/events/SDL_mouse.c
index 0ac993cb0e277..81f08de732968 100644
--- a/src/events/SDL_mouse.c
+++ b/src/events/SDL_mouse.c
@@ -45,7 +45,11 @@ SDL_MouseNormalSpeedScaleChanged(void *userdata, const char *name, const char *o
 {
     SDL_Mouse *mouse = (SDL_Mouse *)userdata;
 
-    mouse->normal_speed_scale = (float)SDL_atof(hint);
+    if (hint && *hint) {
+        mouse->normal_speed_scale = (float)SDL_atof(hint);
+    } else {
+        mouse->normal_speed_scale = 1.0f;
+    }
 }
 
 static void
@@ -53,7 +57,11 @@ SDL_MouseRelativeSpeedScaleChanged(void *userdata, const char *name, const char
 {
     SDL_Mouse *mouse = (SDL_Mouse *)userdata;
 
-    mouse->relative_speed_scale = (float)SDL_atof(hint);
+    if (hint && *hint) {
+        mouse->relative_speed_scale = (float)SDL_atof(hint);
+    } else {
+        mouse->relative_speed_scale = 1.0f;
+    }
 }
 
 /* Public functions */