diff --git a/CHANGELOG.md b/CHANGELOG.md
index ce26ad5..7c80ba6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,8 @@
 ## Changelog
 
+5.1.0 - 2021-10-22
+- Fixes fatal error on Windows due to readline_callback_handler_install method not present
+
 5.1.0 - 2021-10-21
 - Increased number of queue tracking workers to 4096
 - Enhance queue monitor and process commands
diff --git a/Commands/Monitor.php b/Commands/Monitor.php
index 1cbaea6..5580057 100644
--- a/Commands/Monitor.php
+++ b/Commands/Monitor.php
@@ -71,8 +71,10 @@ protected function doExecute(): int
         $qPerPAge       = min(max($this->getPerPageFromArg(), 1), $qCount);
         $qPageCount     = ceil($qCount / $qPerPAge);
 
-        readline_callback_handler_install('', function () {
-        });
+        if (function_exists('readline_callback_handler_install')) {
+            readline_callback_handler_install('', function () {
+            });
+        }
         stream_set_blocking(STDIN, false);
 
         $output->writeln(str_repeat("-", 30));
diff --git a/plugin.json b/plugin.json
index 3c00ea5..3b3717b 100644
--- a/plugin.json
+++ b/plugin.json
@@ -1,6 +1,6 @@
 {
     "name": "QueuedTracking",
-    "version": "5.1.0",
+    "version": "5.1.1",
     "description": "Scale your large traffic Matomo service by queuing tracking requests in Redis or MySQL for better performance and reliability when experiencing peaks.",
     "theme": false,
     "keywords": ["tracker", "tracking", "queue", "redis"],