1 files changed, 1 insertions, 1 deletions

diff --git a/plugins/check_ntp.c b/plugins/check_ntp.c
index 013c24b..861d0ba 100644
--- a/plugins/check_ntp.c
+++ b/plugins/check_ntp.c
@@ -608,7 +608,7 @@ double jitter_request(const char *host, int *status){
                 }
         }
 
-        rval /= num_valid;
+        rval = num_valid ? rval / num_valid : -1.0;
 
         close(conn);
         free(peers);