diff --git a/engine/client/ref_common.c b/engine/client/ref_common.c
index 7fc5e441..122807e9 100644
--- a/engine/client/ref_common.c
+++ b/engine/client/ref_common.c
@@ -315,10 +315,15 @@ static screenfade_t *pfnRefGetScreenFade( void )
 
 static qboolean R_Init_Video_( ref_graphic_apis_t type )
 {
-	host.apply_opengl_config = true;
-	Cbuf_AddTextf( "exec %s.cfg\n", ref.dllFuncs.R_GetConfigName());
-	Cbuf_Execute();
-	host.apply_opengl_config = false;
+	const char *config_name = ref.dllFuncs.R_GetConfigName ? ref.dllFuncs.R_GetConfigName() : NULL;
+
+	if( config_name )
+	{
+		host.apply_opengl_config = true;
+		Cbuf_AddTextf( "exec %s.cfg\n", config_name );
+		Cbuf_Execute();
+		host.apply_opengl_config = false;
+	}
 
 	return R_Init_Video( type );
 }
diff --git a/engine/common/con_utils.c b/engine/common/con_utils.c
index 7012a82a..e24513f0 100644
--- a/engine/common/con_utils.c
+++ b/engine/common/con_utils.c
@@ -1542,14 +1542,19 @@ save opengl variables into opengl.cfg
 */
 void Host_WriteOpenGLConfig( void )
 {
+	const char *config_name;
 	string name;
 	file_t	*f;
 
-	if( Sys_CheckParm( "-nowriteconfig" ) )
+	if( Sys_CheckParm( "-nowriteconfig" ) || !ref.dllFuncs.R_GetConfigName )
 		return;
 
-	Q_snprintf( name, sizeof( name ), "%s.cfg", ref.dllFuncs.R_GetConfigName() );
+	config_name = ref.dllFuncs.R_GetConfigName();
 
+	if( !config_name )
+		return;
+
+	Q_snprintf( name, sizeof( name ), "%s.cfg", config_name );
 
 	f = FS_Open( va( "%s.new", name ), "w", false );
 	if( f )
diff --git a/engine/server/sv_frame.c b/engine/server/sv_frame.c
index fd71183d..89c8ce53 100644
--- a/engine/server/sv_frame.c
+++ b/engine/server/sv_frame.c
@@ -821,7 +821,6 @@ void SV_SendClientMessages( void )
 {
 	sv_client_t *cl;
 	int          i;
-	double       updaterate_time;
 	double       time_until_next_message;
 
 	if( sv.state == ss_dead )