diff --git a/poppler/JBIG2Stream.cc b/poppler/JBIG2Stream.cc
index a20c220..63f6069 100644
--- a/poppler/JBIG2Stream.cc
+++ b/poppler/JBIG2Stream.cc
@@ -1916,7 +1916,7 @@ GBool JBIG2Stream::readSymbolDictSeg(Guint segNum, Guint length,
 
   // create the symbol dict object
   symbolDict = new JBIG2SymbolDict(segNum, numExSyms);
-  if (!symbolDict->isOk()) {
+  if (numExSyms > 0 && !symbolDict->isOk()) {
     delete symbolDict;
     goto syntaxError;
   }