From 8051fd54459d8a7cec55d14dbc9a4e4444f2c626 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bastian=20K=C3=B6cher?= <bkchr@users.noreply.github.com>
Date: Thu, 17 Oct 2019 23:35:41 +0200
Subject: [PATCH] Don't panic when we try to register 2 global loggers (#3840)

---
 substrate/core/cli/src/lib.rs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/substrate/core/cli/src/lib.rs b/substrate/core/cli/src/lib.rs
index c5af33b738..e891f90dc2 100644
--- a/substrate/core/cli/src/lib.rs
+++ b/substrate/core/cli/src/lib.rs
@@ -919,7 +919,9 @@ fn init_logger(pattern: &str) {
 		writeln!(buf, "{}", output)
 	});
 
-	builder.init();
+	if builder.try_init().is_err() {
+		info!("Not registering Substrate logger, as there is already a global logger registered!");
+	}
 }
 
 fn kill_color(s: &str) -> String {