diff --git a/lib/handlers/get.js b/lib/handlers/get.js
index f4aed8eeb..dd46461af 100644
--- a/lib/handlers/get.js
+++ b/lib/handlers/get.js
@@ -116,10 +116,9 @@ async function handler (req, res, next) {
 
   // If it is not in our RDFs we can't even translate,
   // Sorry, we can't help
-  if (!possibleRDFType) {
-    return next(error(406, 'Cannot serve requested type: ' + contentType))
+  if (!possibleRDFType || !RDFs.includes(requestedType)) {
+    return next(error(406, 'Cannot serve requested type: ' + requestedType))
   }
-
   try {
     // Translate from the contentType found to the possibleRDFType desired
     const data = await translate(stream, baseUri, contentType, possibleRDFType)
@@ -127,9 +126,10 @@ async function handler (req, res, next) {
     res.setHeader('Content-Type', possibleRDFType)
     res.send(data)
     return next()
-  } catch (err) {
-    debug('error translating: ' + req.originalUrl + ' ' + contentType + ' -> ' + possibleRDFType + ' -- ' + 500 + ' ' + err.message)
-    return next(error(500, 'Error translating between RDF formats'))
+  }
+  catch (err) {
+    debug('error translating: ' + req.originalUrl + ' ' + contentType + ' -> ' + possibleRDFType + ' -- ' + 406 + ' ' + err.message)
+    return next(error(406, 'Cannot serve requested type: ' + requestedType))
   }
 }