diff --git a/classes/Feeds.php b/classes/Feeds.php
index a97ac221f..ac7a58f26 100644
--- a/classes/Feeds.php
+++ b/classes/Feeds.php
@@ -750,7 +750,7 @@ class Feeds extends Handler_Protected {
 				<h1>Feed Debugger: <?= "$feed_id: " . $this->_get_title($feed_id) ?></h1>
 				<div class="content">
 					<form method="post" action="" dojoType="dijit.form.Form">
-						<?= \Controls\hidden_tag("op", "feeds") ?>
+						<?= \Controls\hidden_tag("op", "Feeds") ?>
 						<?= \Controls\hidden_tag("method", "updatedebugger") ?>
 						<?= \Controls\hidden_tag("csrf_token", $csrf_token) ?>
 						<?= \Controls\hidden_tag("action", "do_update") ?>
diff --git a/classes/PluginHost.php b/classes/PluginHost.php
index 7778c008f..cc9f65f19 100644
--- a/classes/PluginHost.php
+++ b/classes/PluginHost.php
@@ -889,7 +889,7 @@ class PluginHost {
 	}
 
 	/**
-	 * handled by classes/pluginhandler.php, requires valid session
+	 * handled by classes/PluginHandler.php, requires valid session
 	 *
 	 * @param array<int|string, mixed> $params
 	 */
diff --git a/include/controls.php b/include/controls.php
index 1ea019769..2fa797dbc 100755
--- a/include/controls.php
+++ b/include/controls.php
@@ -29,7 +29,7 @@
    }
 
    function pluginhandler_tags(\Plugin $plugin, string $method): string {
-      return hidden_tag("op", "pluginhandler") .
+      return hidden_tag("op", "PluginHandler") .
                hidden_tag("plugin", strtolower(get_class($plugin))) .
                hidden_tag("method", $method);
    }
diff --git a/js/Article.js b/js/Article.js
index 85cee6322..694c7e616 100644
--- a/js/Article.js
+++ b/js/Article.js
@@ -352,7 +352,7 @@ const Article = {
 			title: __("Article tags"),
 			content: `
 				${App.FormFields.hidden_tag("id", id.toString())}
-				${App.FormFields.hidden_tag("op", "article")}
+				${App.FormFields.hidden_tag("op", "Article")}
 				${App.FormFields.hidden_tag("method", "setArticleTags")}
 
 				<header class='horizontal'>
diff --git a/js/CommonDialogs.js b/js/CommonDialogs.js
index e7190e07c..8d4241ef8 100644
--- a/js/CommonDialogs.js
+++ b/js/CommonDialogs.js
@@ -35,7 +35,7 @@ const	CommonDialogs = {
 							content: `
 								<form onsubmit='return false'>
 
-									${App.FormFields.hidden_tag("op", "feeds")}
+									${App.FormFields.hidden_tag("op", "Feeds")}
 									${App.FormFields.hidden_tag("method", "add")}
 
 									<div id='fadd_error_message' style='display : none' class='alert alert-danger'></div>
diff --git a/js/PrefHelpers.js b/js/PrefHelpers.js
index 7a4c99340..cf822d987 100644
--- a/js/PrefHelpers.js
+++ b/js/PrefHelpers.js
@@ -280,7 +280,7 @@ const	Helpers = {
 						${__("You can override colors, fonts and layout of your currently selected theme with custom CSS declarations here.")}
 					</div>
 
-					${App.FormFields.hidden_tag('op', 'rpc')}
+					${App.FormFields.hidden_tag('op', 'RPC')}
 					${App.FormFields.hidden_tag('method', 'setpref')}
 					${App.FormFields.hidden_tag('key', 'USER_STYLESHEET')}
 
diff --git a/plugins/af_psql_trgm/init.js b/plugins/af_psql_trgm/init.js
index 921272c4b..f3662a389 100644
--- a/plugins/af_psql_trgm/init.js
+++ b/plugins/af_psql_trgm/init.js
@@ -10,7 +10,7 @@ Plugins.Psql_Trgm = {
 		const tmph = dojo.connect(dialog, "onShow", null, function (/* e */) {
 			dojo.disconnect(tmph);
 
-			xhr.post("backend.php", {op: 'pluginhandler', plugin: 'af_psql_trgm', method: 'showrelated', id: id}, (reply) => {
+			xhr.post("backend.php", {op: 'PluginHandler', plugin: 'af_psql_trgm', method: 'showrelated', id: id}, (reply) => {
 				dialog.attr('content', reply);
 			});
 		});