src/plugin.c: Assert that "data_sets" is non-NULL.

Otherwise we might run into an assertion in the AVL tree. This can be
triggered e.g. when calling plugin_get_ds() from within a config
callback.

diff --git a/src/plugin.c b/src/plugin.c
index 453e896..4c6a032 100644 (file)
--- a/src/plugin.c
+++ b/src/plugin.c
@@ -2016,6 +2016,12 @@ const data_set_t *plugin_get_ds (const char *name)
 {
        data_set_t *ds;
 
+       if (data_sets == NULL)
+       {
+               ERROR ("plugin_get_ds: No data sets are defined yet.");
+               return (NULL);
+       }
+
        if (c_avl_get (data_sets, name, (void *) &ds) != 0)
        {
                DEBUG ("No such dataset registered: %s", name);