*fix* tooltip copys the displayed text

[chaz/tint2] / src / util / timer.c

diff --git a/src/util/timer.c b/src/util/timer.c
index 59064dd1eddfde834fb9354be6c8daa46eb02d98..e218877946dec17bdf0263b47257d8368227b659 100644 (file)
--- a/src/util/timer.c
+++ b/src/util/timer.c
@@ -25,7 +25,7 @@ GSList* timer_list = 0;
 
 int install_timer(int value_sec, int value_nsec, int interval_sec, int interval_nsec, void (*_callback)())
 {
-       if ( value_sec < 0 || interval_sec < 0 )
+       if ( value_sec < 0 || interval_sec < 0 || _callback == 0 )
                return -1;
 
        int timer_fd;