diff --git a/bin/mpd-monitor b/bin/mpd-monitor
index 7f20022..5a09399 100755
--- a/bin/mpd-monitor
+++ b/bin/mpd-monitor
@@ -1,4 +1,7 @@
 #!/bin/sh
+
+# quit if another instance is already running
+[ -z $(pidof mpd-monitor) ] && echo "mpd-monitor already running";exit
 ID=$(mpc current -f %id% )
 mpc idleloop |
   while read -r event; do 
@@ -7,7 +10,7 @@ mpc idleloop |
 
     # get current id to compare to init id
     NEW_ID=$(mpc current -f %id%)
-    # if a player even is output, but the track has not changed, skip rest of loop
+    # if a player event is output, but the track has not changed, skip rest of loop
     [ "$NEW_ID" != "$ID" ] || continue
     ID=$NEW_ID