diff --git a/module/Core/src/Config/DeprecatedConfigParser.php b/module/Core/src/Config/DeprecatedConfigParser.php
index 059c81a9..92074bfc 100644
--- a/module/Core/src/Config/DeprecatedConfigParser.php
+++ b/module/Core/src/Config/DeprecatedConfigParser.php
@@ -10,7 +10,7 @@ class DeprecatedConfigParser
 {
     public function __invoke(array $config): array
     {
-        return compose([$this, 'parseNotFoundRedirect'])($config);
+        return compose([$this, 'parseNotFoundRedirect'], [$this, 'removeSecretKey'])($config);
     }
 
     public function parseNotFoundRedirect(array $config): array
@@ -30,4 +30,11 @@ class DeprecatedConfigParser
 
         return $config;
     }
+
+    public function removeSecretKey(array $config): array
+    {
+        // Removing secret_key from any generated config will prevent the AppOptions object from crashing
+        unset($config['app_options']['secret_key']);
+        return $config;
+    }
 }
diff --git a/module/Core/test/Config/DeprecatedConfigParserTest.php b/module/Core/test/Config/DeprecatedConfigParserTest.php
index 3d6d4815..0da1d314 100644
--- a/module/Core/test/Config/DeprecatedConfigParserTest.php
+++ b/module/Core/test/Config/DeprecatedConfigParserTest.php
@@ -91,4 +91,21 @@ class DeprecatedConfigParserTest extends TestCase
 
         $this->assertEquals($expected, $result);
     }
+
+    /** @test */
+    public function removesTheOldSecretKey(): void
+    {
+        $config = [
+            'app_options' => [
+                'secret_key' => 'foobar',
+            ],
+        ];
+        $expected = [
+            'app_options' => [],
+        ];
+
+        $result = ($this->postProcessor)($config);
+
+        $this->assertEquals($expected, $result);
+    }
 }