diff --git a/src/pt/argosscan/build.gradle b/src/pt/argosscan/build.gradle
index f798556a3..2343dfcbc 100644
--- a/src/pt/argosscan/build.gradle
+++ b/src/pt/argosscan/build.gradle
@@ -6,7 +6,7 @@ ext {
     extName = 'Argos Scan'
     pkgNameSuffix = 'pt.argosscan'
     extClass = '.ArgosScan'
-    extVersionCode = 17
+    extVersionCode = 18
 }
 
 dependencies {
diff --git a/src/pt/argosscan/src/eu/kanade/tachiyomi/extension/pt/argosscan/ArgosScan.kt b/src/pt/argosscan/src/eu/kanade/tachiyomi/extension/pt/argosscan/ArgosScan.kt
index 948cd0a1a..9dad4cb9b 100644
--- a/src/pt/argosscan/src/eu/kanade/tachiyomi/extension/pt/argosscan/ArgosScan.kt
+++ b/src/pt/argosscan/src/eu/kanade/tachiyomi/extension/pt/argosscan/ArgosScan.kt
@@ -294,6 +294,13 @@ class ArgosScan : HttpSource(), ConfigurableSource {
 
         if (!email.isNullOrEmpty() && !password.isNullOrEmpty() && token.isNullOrEmpty()) {
             val loginResponse = chain.proceed(loginRequest(email, password))
+
+            if (!loginResponse.headers["Content-Type"].orEmpty().contains("application/json")) {
+                loginResponse.close()
+
+                throw IOException(CLOUDFLARE_ERROR)
+            }
+
             val loginResult = json.parseToJsonElement(loginResponse.body!!.string()).jsonObject
 
             if (loginResult["errors"] != null) {
@@ -356,6 +363,7 @@ class ArgosScan : HttpSource(), ConfigurableSource {
         private const val PASSWORD_PREF_SUMMARY = "Defina a senha de sua conta no site."
         private const val PASSWORD_PREF_DIALOG = EMAIL_PREF_DIALOG
 
+        private const val CLOUDFLARE_ERROR = "Falha ao contornar o Cloudflare."
         private const val REQUEST_ERROR = "Erro na requisição. Tente novamente mais tarde."
 
         private val JSON_MEDIA_TYPE = "application/json; charset=utf-8".toMediaTypeOrNull()