diff --git a/includes/class-setup.php b/includes/class-setup.php
index e362a85..4aa8c90 100644
--- a/includes/class-setup.php
+++ b/includes/class-setup.php
@@ -92,6 +92,15 @@ class Setup {
 		return self::$instance;
 	}
 
+	/**
+	 * Getter function for whether the ActivityPub plugin is active.
+	 *
+	 * @return bool True when the ActivityPub plugin is active.
+	 */
+	public function is_activitypub_plugin_active(): bool {
+		return $this->activitypub_plugin_is_active;
+	}
+
 	/**
 	 * LooksUp the current version of the ActivityPub.
 	 *
@@ -135,6 +144,9 @@ class Setup {
 	 * @return void
 	 */
 	public function redetect_active_event_plugins(): void {
+		if ( ! $this->activitypub_plugin_is_active ) {
+			return;
+		}
 		delete_transient( 'event_bridge_for_activitypub_active_event_plugins' );
 		$this->detect_active_event_plugins();
 	}
@@ -152,6 +164,11 @@ class Setup {
 			return $active_event_plugins;
 		}
 
+		// Detection will fail in case the ActivityPub plugin is not active.
+		if ( ! $this->activitypub_plugin_is_active ) {
+			return array();
+		}
+
 		if ( ! function_exists( 'get_plugins' ) ) {
 			require_once ABSPATH . 'wp-admin/includes/plugin.php';
 		}
@@ -203,16 +220,6 @@ class Setup {
 		$this->activitypub_plugin_is_active = defined( 'ACTIVITYPUB_PLUGIN_VERSION' ) || \is_plugin_active( 'activitypub/activitypub.php' );
 		$this->activitypub_plugin_version   = self::get_activitypub_plugin_version();
 
-		// Detect active supported event plugins.
-		$this->detect_active_event_plugins();
-
-		// Register hook that runs when this plugin gets activated.
-		register_activation_hook( EVENT_BRIDGE_FOR_ACTIVITYPUB_PLUGIN_FILE, array( $this, 'activate' ) );
-
-		// Register listeners whenever any plugin gets activated or deactivated.
-		add_action( 'activated_plugin', array( $this, 'redetect_active_event_plugins' ) );
-		add_action( 'deactivated_plugin', array( $this, 'redetect_active_event_plugins' ) );
-
 		// Add hook that takes care of all notices in the Admin UI.
 		add_action( 'admin_init', array( $this, 'do_admin_notices' ) );
 
@@ -222,6 +229,13 @@ class Setup {
 		// Add hook that loads CSS and JavaScript files for the Admin UI.
 		add_action( 'admin_enqueue_scripts', array( self::class, 'enqueue_styles' ) );
 
+		// Register hook that runs when this plugin gets activated.
+		register_activation_hook( EVENT_BRIDGE_FOR_ACTIVITYPUB_PLUGIN_FILE, array( $this, 'activate' ) );
+
+		// Register listeners whenever any plugin gets activated or deactivated.
+		add_action( 'activated_plugin', array( $this, 'redetect_active_event_plugins' ) );
+		add_action( 'deactivated_plugin', array( $this, 'redetect_active_event_plugins' ) );
+
 		// Register the settings page(s) of this plugin to the WordPress admin menu.
 		add_action( 'admin_menu', array( Settings_Page::class, 'admin_menu' ) );
 		add_filter(
@@ -230,7 +244,15 @@ class Setup {
 		);
 
 		// If we don't have any active event plugins, or the ActivityPub plugin is not enabled, abort here.
-		if ( empty( $this->active_event_plugins ) || ! $this->activitypub_plugin_is_active ) {
+		if ( ! $this->activitypub_plugin_is_active ) {
+			return;
+		}
+
+		// Detect active supported event plugins.
+		$this->detect_active_event_plugins();
+
+		// If we don't have any active event plugins, or the ActivityPub plugin is not enabled, abort here.
+		if ( empty( $this->active_event_plugins ) ) {
 			return;
 		}
 
@@ -292,15 +314,17 @@ class Setup {
 		// Check if any general admin notices are needed and add actions to insert the needed admin notices.
 		if ( ! $this->activitypub_plugin_is_active ) {
 			// The ActivityPub plugin is not active.
-			add_action( 'admin_notices', array( 'Event_Bridge_For_ActivityPub\Admin\General_Admin_Notices', 'activitypub_plugin_not_enabled' ), 10, 1 );
+			add_action( 'admin_notices', array( General_Admin_Notices::class, 'activitypub_plugin_not_enabled' ), 10, 1 );
+			return;
 		}
 		if ( ! version_compare( $this->activitypub_plugin_version, EVENT_BRIDGE_FOR_ACTIVITYPUB_ACTIVITYPUB_PLUGIN_MIN_VERSION ) ) {
 			// The ActivityPub plugin is too old.
-			add_action( 'admin_notices', array( 'Event_Bridge_For_ActivityPub\Admin\General_Admin_Notices', 'activitypub_plugin_version_too_old' ), 10, 1 );
+			add_action( 'admin_notices', array( General_Admin_Notices::class, 'activitypub_plugin_version_too_old' ), 10, 1 );
+			return;
 		}
 		if ( empty( $this->active_event_plugins ) ) {
 			// No supported Event Plugin is active.
-			add_action( 'admin_notices', array( 'Event_Bridge_For_ActivityPub\Admin\General_Admin_Notices', 'no_supported_event_plugin_active' ), 10, 1 );
+			add_action( 'admin_notices', array( General_Admin_Notices::class, 'no_supported_event_plugin_active' ), 10, 1 );
 		}
 	}
 
diff --git a/templates/event-sources.php b/templates/event-sources.php
index 3da2441..6484a24 100644
--- a/templates/event-sources.php
+++ b/templates/event-sources.php
@@ -20,36 +20,38 @@ defined( 'ABSPATH' ) || exit; // @codeCoverageIgnore
 ?>
 
 <div class="wrap event_bridge_for_activitypub-admin-table-container">
-	<!-- Table title with add new button like on post edit pages -->
-	<div class="event_bridge_for_activitypub-admin-table-top">
-		<h2 class="wp-heading-inline"> <?php esc_html_e( 'List of Event Sources', 'event-bridge-for-activitypub' ); ?> </h2>
-		<!-- Button that triggers ThickBox -->
-		<a href="#TB_inline?width=600&height=400&inlineId=Event_Bridge_For_ActivityPub_add_new_source" class="thickbox page-title-action">
-			<?php esc_html_e( 'Add Event Source', 'event-bridge-for-activitypub' ); ?>
-		</a>
-	</div>
+	<?php if ( defined( 'ACTIVITYPUB_PLUGIN_VERSION' ) ) { ?>
+		<!-- Table title with add new button like on post edit pages -->
+		<div class="event_bridge_for_activitypub-admin-table-top">
+			<h2 class="wp-heading-inline"> <?php esc_html_e( 'List of Event Sources', 'event-bridge-for-activitypub' ); ?> </h2>
+			<!-- Button that triggers ThickBox -->
+			<a href="#TB_inline?width=600&height=400&inlineId=Event_Bridge_For_ActivityPub_add_new_source" class="thickbox page-title-action">
+				<?php esc_html_e( 'Add Event Source', 'event-bridge-for-activitypub' ); ?>
+			</a>
+		</div>
 
-	<!-- ThickBox content (hidden initially) -->
-	<div id="Event_Bridge_For_ActivityPub_add_new_source" style="display:none;">
-		<h2><?php esc_html_e( 'Add new ActivityPub follow', 'event-bridge-for-activitypub' ); ?> </h2>
-		<p> <?php esc_html_e( 'Here you can enter either a Fediverse handle (@username@example.social), URL of an ActivityPub Account (https://example.social/user/username) or instance URL.', 'event-bridge-for-activitypub' ); ?> </p>
-		<form method="post" action="options.php">
-			<?php \settings_fields( 'event-bridge-for-activitypub-event-sources' ); ?>
-			<input type="text" name="event_bridge_for_activitypub_event_source" id="event_bridge_for_activitypub_event_source" value="">
-			<?php \submit_button( __( 'Add Event Source', 'event-bridge-for-activitypub' ) ); ?>
-		</form>
-	</div>
-	<div class="wrap activitypub-followers-page">
-		<form method="get">
-			<input type="hidden" name="page" value="event-bridge-for-activitypub" />
-			<input type="hidden" name="tab" value="event-sources" />
-			<?php
-			$table = new \Event_Bridge_For_ActivityPub\Table\Event_Sources();
-			$table->prepare_items();
-			$table->search_box( 'Search', 'search' );
-			$table->display();
-			?>
-		</form>
-	</div>
+		<!-- ThickBox content (hidden initially) -->
+		<div id="Event_Bridge_For_ActivityPub_add_new_source" style="display:none;">
+			<h2><?php esc_html_e( 'Add new ActivityPub follow', 'event-bridge-for-activitypub' ); ?> </h2>
+			<p> <?php esc_html_e( 'Here you can enter either a Fediverse handle (@username@example.social), URL of an ActivityPub Account (https://example.social/user/username) or instance URL.', 'event-bridge-for-activitypub' ); ?> </p>
+			<form method="post" action="options.php">
+				<?php \settings_fields( 'event-bridge-for-activitypub-event-sources' ); ?>
+				<input type="text" name="event_bridge_for_activitypub_event_source" id="event_bridge_for_activitypub_event_source" value="">
+				<?php \submit_button( __( 'Add Event Source', 'event-bridge-for-activitypub' ) ); ?>
+			</form>
+		</div>
+		<div class="wrap activitypub-followers-page">
+			<form method="get">
+				<input type="hidden" name="page" value="event-bridge-for-activitypub" />
+				<input type="hidden" name="tab" value="event-sources" />
+				<?php
+				$table = new \Event_Bridge_For_ActivityPub\Table\Event_Sources();
+				$table->prepare_items();
+				$table->search_box( 'Search', 'search' );
+				$table->display();
+				?>
+			</form>
+		</div>
+	<?php } ?>
 </div>
 
diff --git a/templates/settings.php b/templates/settings.php
index 860fdaa..7d1fff2 100644
--- a/templates/settings.php
+++ b/templates/settings.php
@@ -23,6 +23,9 @@ defined( 'ABSPATH' ) || exit; // @codeCoverageIgnore
 );
 
 use Activitypub\Activity\Extended_Object\Event;
+use Event_Bridge_For_ActivityPub\Setup;
+
+$activitypub_plugin_is_active = Setup::get_instance()->is_activitypub_plugin_active();
 
 if ( ! isset( $args ) || ! array_key_exists( 'event_terms', $args ) ) {
 	return;
@@ -100,6 +103,7 @@ $current_category_mapping        = \get_option( 'event_bridge_for_activitypub_ev
 			</div>
 		</div>
 
+		<?php if ( $activitypub_plugin_is_active ) { ?>
 		<div class="box">
 			<h2><?php \esc_html_e( 'Event Sources', 'event-bridge-for-activitypub' ); ?></h2>
 			<?php
@@ -215,6 +219,7 @@ $current_category_mapping        = \get_option( 'event_bridge_for_activitypub_ev
 			}
 			?>
 		</div>
+		<?php } ?>
 
 		<div class="box">
 			<h2> <?php esc_html_e( 'ActivityPub Event Category', 'event-bridge-for-activitypub' ); ?> </h2>
diff --git a/templates/welcome.php b/templates/welcome.php
index 4276336..2ee205b 100644
--- a/templates/welcome.php
+++ b/templates/welcome.php
@@ -24,6 +24,7 @@ use Event_Bridge_For_ActivityPub\Admin\Health_Check;
 );
 
 $active_event_plugins                   = Setup::get_instance()->get_active_event_plugins();
+$activitypub_plugin_is_active           = Setup::get_instance()->is_activitypub_plugin_active();
 $event_bridge_for_activitypub_status_ok = true;
 $example_event_post                     = Health_Check::get_most_recent_event_posts();
 
@@ -45,7 +46,9 @@ WP_Filesystem();
 		<h2><?php \esc_html_e( 'Status', 'event-bridge-for-activitypub' ); ?></h2>
 		<p><?php \esc_html_e( 'The Event Bridge for ActivityPub detected the following (activated) event plugins:', 'event-bridge-for-activitypub' ); ?></p>
 			<?php
-			if ( empty( $active_event_plugins ) ) {
+			if ( ! $activitypub_plugin_is_active ) {
+				$notice = General_Admin_Notices::get_admin_notice_activitypub_plugin_not_enabled();
+			} elseif ( empty( $active_event_plugins ) ) {
 				$notice = General_Admin_Notices::get_admin_notice_no_supported_event_plugin_active();
 			}
 			echo '<p>⚠' . \wp_kses( $notice, General_Admin_Notices::ALLOWED_HTML ) . '</p>';