diff --git a/liblog/logd_write.c b/liblog/logd_write.c
index a865093..8f8cc3f 100644
--- a/liblog/logd_write.c
+++ b/liblog/logd_write.c
@@ -178,6 +178,10 @@
     static pid_t last_pid = (pid_t) -1;
     static atomic_int_fast32_t dropped;
 
+    if (!nr) {
+        return -EINVAL;
+    }
+
     if (last_uid == AID_ROOT) { /* have we called to get the UID yet? */
         last_uid = getuid();
     }