1 files changed, 5 insertions, 1 deletions

diff --git a/plugins/popen.c b/plugins/popen.c
index 04eb388..062cf27 100644
--- a/plugins/popen.c
+++ b/plugins/popen.c
@@ -243,8 +243,12 @@ static int openmax = 0;
 void
 popen_timeout_alarm_handler (int signo)
 {
+        int fh;
         if (signo == SIGALRM) {
-                kill (childpid[fileno (child_process)], SIGKILL);
+                fh=fileno (child_process);
+                if(fh >= 0){
+                        kill (childpid[fh], SIGKILL);
+                }
                 printf (_("CRITICAL - Plugin timed out after %d seconds\n"),
                                                 timeout_interval);
                 exit (STATE_CRITICAL);