1 files changed, 3 insertions, 0 deletions

diff --git a/swaybar/status_line.c b/swaybar/status_line.c
index fb9271f8..71ceb1d0 100644
--- a/swaybar/status_line.c
+++ b/swaybar/status_line.c
@@ -1,4 +1,5 @@
 #define _POSIX_C_SOURCE 200809L
+#include <assert.h>
 #include <fcntl.h>
 #include <sys/ioctl.h>
 #include <json.h>
@@ -153,6 +154,8 @@ struct status_line *status_line_init(char *cmd) {
                 exit(1);
         }
 
+        assert(!getenv("WAYLAND_SOCKET") && "display must be initialized before "
+                " starting `status-command`; WAYLAND_SOCKET should not be set");
         status->pid = fork();
         if (status->pid == 0) {
                 dup2(pipe_read_fd[1], STDOUT_FILENO);