Check if we have an instance before dereferencing it

If we don't have a GPS service userid in the preferences and the GpsLocation class
isn't instantiated, this would cause a crash.

Fixes #367

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/core/gpslocation.cpp b/core/gpslocation.cpp
index 1c5d378cf..30b101419 100644
--- a/core/gpslocation.cpp
+++ b/core/gpslocation.cpp
@@ -46,6 +46,11 @@ GpsLocation *GpsLocation::instance()
 	return m_Instance;
 }
 
+bool GpsLocation::hasInstance()
+{
+	return m_Instance != NULL;
+}
+
 GpsLocation::~GpsLocation()
 {
 	m_Instance = NULL;