rrdtool plugin: Fix a possible race condition at startup.

[collectd.git] / src / utils_avltree.c

diff --git a/src/utils_avltree.c b/src/utils_avltree.c
index 9f0b796..3e258e9 100644 (file)
--- a/src/utils_avltree.c
+++ b/src/utils_avltree.c
@@ -581,6 +581,8 @@ int c_avl_get (c_avl_tree_t *t, const void *key, void **value)
 {
        c_avl_node_t *n;
 
+       assert (t != NULL);
+
        n = search (t, key);
        if (n == NULL)
                return (-1);