webupdatev1

backend/middleware/errorHandler.js

@@ -62,6 +62,15 @@ const errorHandler = (err, req, res, next) => {
     error.statusCode = errorMapping.statusCode;
   }
 
+  // SAFEGUARD: Don't send response if headers already sent
+  if (res.headersSent) {
+    logger.warn("Headers already sent in error handler", {
+      path: req.path,
+      error: error.message,
+    });
+    return next(err);
+  }
+
   res.status(error.statusCode).json({
     success: false,
     message: error.message || "Server error",
@@ -89,6 +98,12 @@ const notFoundHandler = (req, res) => {
     });
   }
 
+  // SAFEGUARD: Check if response already sent
+  if (res.headersSent) {
+    logger.warn("Headers already sent in 404 handler", { path: req.path });
+    return;
+  }
+
   res.status(404).json({
     success: false,
     message: "Route not found",