diff --git a/packages/backend/src/controller/csrfCheck.ts b/packages/backend/src/controller/csrfCheck.ts
index 1826ddd..5931428 100644
--- a/packages/backend/src/controller/csrfCheck.ts
+++ b/packages/backend/src/controller/csrfCheck.ts
@@ -7,13 +7,13 @@ const httpUtils = new HttpUtils();
 export class CsrfCheck {
   private isTargetUri(uri: string): boolean {
     if (
-      httpUtils.getQueryParamFromURI(uri, "client_id") &&
-      (httpUtils.getQueryParamFromURI(uri, "response_type") ||
-        httpUtils.getQueryParamFromURI(uri, "grant_type") ||
-        httpUtils.getQueryParamFromURI(uri, "redirect_uri") ||
-        httpUtils.getQueryParamFromURI(uri, "scope") ||
-        httpUtils.getQueryParamFromURI(uri, "state") ||
-        httpUtils.getQueryParamFromURI(uri, "nonce"))
+      httpUtils.getQueryParamFromURI(uri, "client_id") !== null &&
+      (httpUtils.getQueryParamFromURI(uri, "response_type") !== null ||
+        httpUtils.getQueryParamFromURI(uri, "grant_type") !== null ||
+        httpUtils.getQueryParamFromURI(uri, "redirect_uri") !== null ||
+        httpUtils.getQueryParamFromURI(uri, "scope") !== null ||
+        httpUtils.getQueryParamFromURI(uri, "state") !== null ||
+        httpUtils.getQueryParamFromURI(uri, "nonce") !== null)
     ) {
       return true;
     }