diff --git a/Sora/Utils/Extensions/JavaScriptCore+Extensions.swift b/Sora/Utils/Extensions/JavaScriptCore+Extensions.swift
index de71bb5..ab1a40d 100644
--- a/Sora/Utils/Extensions/JavaScriptCore+Extensions.swift
+++ b/Sora/Utils/Extensions/JavaScriptCore+Extensions.swift
@@ -111,19 +111,33 @@ extension JSContext {
             let task = URLSession.fetchData(allowRedirects: redirect.boolValue).downloadTask(with: request) { tempFileURL, response, error in
                 if let error = error {
                     Logger.shared.log("Network error in fetchV2NativeFunction: \(error.localizedDescription)", type: "Error")
-                    reject.call(withArguments: [error.localizedDescription])
+                    DispatchQueue.main.async {
+                        reject.call(withArguments: [error.localizedDescription])
+                    }
                     return
                 }
                 
                 guard let tempFileURL = tempFileURL else {
                     Logger.shared.log("No data in response", type: "Error")
-                    reject.call(withArguments: ["No data"])
+                    DispatchQueue.main.async {
+                        reject.call(withArguments: ["No data"])
+                    }
                     return
                 }
-                // initialise return Object
+                
+                var safeHeaders: [String: String] = [:]
+                if let httpResponse = response as? HTTPURLResponse {
+                    for (key, value) in httpResponse.allHeaderFields {
+                        if let keyString = key as? String,
+                           let valueString = value as? String {
+                            safeHeaders[keyString] = valueString
+                        }
+                    }
+                }
+
                 var responseDict: [String: Any] = [
                     "status": (response as? HTTPURLResponse)?.statusCode ?? 0,
-                    "headers": (response as? HTTPURLResponse)?.allHeaderFields ?? [:],
+                    "headers": safeHeaders,
                     "body": ""
                 ]
                 
@@ -132,23 +146,29 @@ extension JSContext {
                     
                     if data.count > 10_000_000 {
                         Logger.shared.log("Response exceeds maximum size", type: "Error")
-                        reject.call(withArguments: ["Response exceeds maximum size"])
+                        DispatchQueue.main.async {
+                            reject.call(withArguments: ["Response exceeds maximum size"])
+                        }
                         return
                     }
               
                     if let text = String(data: data, encoding: .utf8) {
-                        
                         responseDict["body"] = text
-                        resolve.call(withArguments: [responseDict])
+                        DispatchQueue.main.async {
+                            resolve.call(withArguments: [responseDict])
+                        }
                     } else {
-                        // rather than reject -> resolve with empty body as user can utilise reponse headers.
                         Logger.shared.log("Unable to decode data to text", type: "Error")
-                        resolve.call(withArguments: [responseDict])
+                        DispatchQueue.main.async {
+                            resolve.call(withArguments: [responseDict])
+                        }
                     }
                     
                 } catch {
                     Logger.shared.log("Error reading downloaded file: \(error.localizedDescription)", type: "Error")
-                    reject.call(withArguments: ["Error reading downloaded file"])
+                    DispatchQueue.main.async {
+                        reject.call(withArguments: ["Error reading downloaded file"])
+                    }
                 }
             }
             task.resume()