1 files changed, 3 insertions, 0 deletions

diff --git a/src/ats/ats_api_performance.c b/src/ats/ats_api_performance.c
index f29cced6c..cbf18a0cc 100644
--- a/src/ats/ats_api_performance.c
+++ b/src/ats/ats_api_performance.c
@@ -740,6 +740,9 @@ GNUNET_ATS_performance_monitor_start (struct GNUNET_ATS_PerformanceHandle * ph,
         struct PendingMessage *p;
         GNUNET_assert (NULL != ph);
 
+        if (NULL == monitor_cb)
+                return NULL;
+
         struct GNUNET_ATS_PerformanceMonitorHandle *phm =
                         GNUNET_malloc (sizeof (struct GNUNET_ATS_PerformanceMonitorHandle));