diff --git a/changelog b/changelog
--- a/changelog
+++ b/changelog
@@ -1,3 +1,9 @@
+pandoc-citeproc (0.11.1)
+
+ * Don't produce ??? with empty suppress-author citation (#156).
+ * Added Typeable, Data instances for CiteprocException. This
+   is needed for some older ghc versions.
+
 pandoc-citeproc (0.11)
 
   * Add Text.CSL.Exception module exporting CiteprocException [API change].
diff --git a/pandoc-citeproc.cabal b/pandoc-citeproc.cabal
--- a/pandoc-citeproc.cabal
+++ b/pandoc-citeproc.cabal
@@ -1,5 +1,5 @@
 name:               pandoc-citeproc
-version:            0.11
+version:            0.11.1
 cabal-version:      >= 1.12
 synopsis:           Supports using pandoc with citeproc
 
diff --git a/src/Text/CSL/Exception.hs b/src/Text/CSL/Exception.hs
--- a/src/Text/CSL/Exception.hs
+++ b/src/Text/CSL/Exception.hs
@@ -1,6 +1,8 @@
 {-# LANGUAGE StandaloneDeriving #-}
+{-# LANGUAGE DeriveDataTypeable #-}
 module Text.CSL.Exception (CiteprocException(..)) where
 import Control.Exception (Exception)
+import Data.Data
 
 data CiteprocException =
        ErrorParsingReferences String
@@ -11,7 +13,7 @@
      | ErrorSplittingDate
      | MacroNotFound          String
      | DependentStyleHasItselfAsParent String
-     deriving Show
+     deriving (Show, Data, Typeable)
 
 instance Exception CiteprocException
 
diff --git a/src/Text/CSL/Pandoc.hs b/src/Text/CSL/Pandoc.hs
--- a/src/Text/CSL/Pandoc.hs
+++ b/src/Text/CSL/Pandoc.hs
@@ -239,8 +239,11 @@
 processCite :: Style -> M.Map [Citation] Formatted -> Inline -> Inline
 processCite s cs (Cite t _) =
    case M.lookup t cs of
-        Just (Formatted (x:xs)) -> Cite t (renderPandoc s (Formatted (x:xs)))
-        _             -> Strong [Str "???"]  -- TODO raise error instead?
+        Just (Formatted xs)
+          | not (null xs) || all isSuppressAuthor t
+               -> Cite t (renderPandoc s (Formatted xs))
+        _      -> Strong [Str "???"] -- TODO raise error instead?
+    where isSuppressAuthor c = citationMode c == SuppressAuthor
 processCite _ _ x = x
 
 isNote :: Inline -> Bool