Fix #0001930

diff --git a/lib/gvc/gvplugin.c b/lib/gvc/gvplugin.c
index 3336201e1161988502f9a257d1530e573a33d986..cb8e2856ea27f30595f6238cc31b0ba4b2f0ca65 100644 (file)
--- a/lib/gvc/gvplugin.c
+++ b/lib/gvc/gvplugin.c
@@ -362,6 +362,10 @@ char *gvplugin_list(GVC_t * gvc, api_t api, const char *str)
     if (api < 0)
        return NULL;
 
+    /* check for valid str */
+    if (! str)
+       return NULL;
+
     if (first) {
        agxbinit(&xb, 0, 0);
        first = 0;