diff --git a/uapi/appapi.py b/uapi/appapi.py
index 858c1ca..826cee8 100644
--- a/uapi/appapi.py
+++ b/uapi/appapi.py
@@ -157,7 +157,11 @@ class UAPI:
 		url = self.env.get('baseurl') + api.path
 		method = api.httpmethod
 		headers = await self.rendertmpl(api.headers)
-		headers = json.loads(headers)
+		try:
+			headers = json.loads(headers)
+		except Exception as e:
+			exception(f'{e}, {headers=},{api.headers=}')
+			raise e
 		body = await self.rendertmpl(api.data)
 		if body:
 			try: