Index: export_openems.c
===================================================================
--- export_openems.c	(revision 31974)
+++ export_openems.c	(revision 31975)
@@ -638,7 +638,7 @@
 static void openems_do_export(rnd_hid_t *hid, rnd_hid_attr_val_t *options)
 {
 	const char *filename;
-	char *runfn, *end;
+	char *runfn = NULL, *end;
 	int save_ons[PCB_MAX_LAYER];
 	int i, len, fmt_matlab;
 	FILE *fsim;