diff --git a/src/Bootstrappers/LogTenancyBootstrapper.php b/src/Bootstrappers/LogTenancyBootstrapper.php
index 5631e5bc..ea1f3393 100644
--- a/src/Bootstrappers/LogTenancyBootstrapper.php
+++ b/src/Bootstrappers/LogTenancyBootstrapper.php
@@ -44,7 +44,9 @@ class LogTenancyBootstrapper implements TenancyBootstrapper
      *
      * Examples:
      * - Array mapping (the default approach): ['slack' => ['url' => 'webhookUrl']] maps $tenant->webhookUrl to slack.url (if $tenant->webhookUrl is not null, otherwise, the override is ignored)
-     * - Closure: ['slack' => fn (Tenant $tenant, array $channel) => array_merge($channel, ['url' => $tenant->slackUrl])]
+     * - Closure: ['slack' => fn (Tenant $tenant, array $channel) => array_merge($channel, ['url' => $tenant->slackUrl])] (the closure should return the whole channel's config)
+     *
+     * In both cases, the override should be an array.
      */
     public static array $channelOverrides = [];
 
@@ -140,7 +142,13 @@ class LogTenancyBootstrapper implements TenancyBootstrapper
         } elseif ($override instanceof Closure) {
             $channelConfigKey = "logging.channels.{$channel}";
 
-            $this->config->set($channelConfigKey, $override($tenant, $this->config->get($channelConfigKey)));
+            $result = $override($tenant, $this->config->get($channelConfigKey));
+
+            if (! is_array($result)) {
+                throw new \InvalidArgumentException("Channel override closure for '{$channel}' must return an array.");
+            }
+
+            $this->config->set($channelConfigKey, $result);
         }
     }
 
diff --git a/tests/Bootstrappers/LogTenancyBootstrapperTest.php b/tests/Bootstrappers/LogTenancyBootstrapperTest.php
index dd530dfc..d738d1d5 100644
--- a/tests/Bootstrappers/LogTenancyBootstrapperTest.php
+++ b/tests/Bootstrappers/LogTenancyBootstrapperTest.php
@@ -140,6 +140,11 @@ test('channel overrides work correctly with both arrays and closures', function
 
     $tenant = Tenant::create(['webhookUrl' => 'tenant-webhook']);
 
+    // Channel override closures must return an array, otherwise an exception is thrown
+    LogTenancyBootstrapper::$channelOverrides['slack'] = fn (Tenant $tenant, array $channel) => 'invalid override';
+
+    expect(fn() => tenancy()->initialize($tenant))->toThrow(InvalidArgumentException::class);
+
     // Test both array mapping and closure-based overrides
     LogTenancyBootstrapper::$channelOverrides = [
         'slack' => ['url' => 'webhookUrl'], // slack.url will be mapped to $tenant->webhookUrl
@@ -148,7 +153,8 @@ test('channel overrides work correctly with both arrays and closures', function
         },
     ];
 
-    tenancy()->initialize($tenant);
+    // Reinitialize tenancy to apply the new overrides
+    tenancy()->reinitialize();
 
     // Array mapping overrides work
     expect(config('logging.channels.slack.url'))->toBe($tenant->webhookUrl);