diff --git a/CHANGELOG.md b/CHANGELOG.md
index 869b79f..29d53e7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,10 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ## [Unreleased]
 
+### Changed
+
+- Show better error message if HTTP status code is 413.
+
 ## [1.17.0] - 2023-03-15
 
 ### Added
diff --git a/src/api/common.ts b/src/api/common.ts
index c139711..92a8d99 100644
--- a/src/api/common.ts
+++ b/src/api/common.ts
@@ -80,7 +80,14 @@ export async function handleResponse(
       return data
     }
   } else {
-    const data = await response.json()
-    throw new Error(data.error_description)
+    let errorDescription
+    if (response.headers.get("Content-Type") === "application/json") {
+      const data = await response.json()
+      errorDescription = data.error_description
+    } else {
+      // Unexpected response
+      errorDescription = response.statusText
+    }
+    throw new Error(errorDescription)
   }
 }