diff --git a/src/utils/os_unix.c b/src/utils/os_unix.c
index eb7f5f2..10b9e0d 100644
--- a/src/utils/os_unix.c
+++ b/src/utils/os_unix.c
@@ -213,6 +213,9 @@
 	size_t len = 128, cwd_len, rel_len, ret_len;
 	int last_errno;
 
+	if (!rel_path)
+		return NULL;
+
 	if (rel_path[0] == '/')
 		return os_strdup(rel_path);