diff --git a/poppler/DCTStream.cc b/poppler/DCTStream.cc
index 90a1377..3c0b505 100644
--- a/poppler/DCTStream.cc
+++ b/poppler/DCTStream.cc
@@ -222,6 +222,9 @@ int DCTStream::getChars(int nChars, Guchar *buffer) {
 }
 
 int DCTStream::lookChar() {
+  if (current == NULL) {
+    return EOF;
+  }
   return *current;
 }