diff --git a/templates/dynamic/ext/sh b/templates/dynamic/ext/sh
index 766dc17..3c12a5e 100755
--- a/templates/dynamic/ext/sh
+++ b/templates/dynamic/ext/sh
@@ -44,6 +44,7 @@ function Func2 {
 function CheckLock {
     Warn Checking lock ...
     [ -e "\$PID_FILE" ] \\
+        && [ -n "\$(cat \$PID_FILE)" ] \\
         && [ -d "/proc/\$(cat \$PID_FILE)" ] \\
         && cat /proc/\$(cat \$PID_FILE)/cmdline \\
         && echo \\