diff -up poppler-0.8.0/poppler-0.8.0/poppler/OptionalContent.cc.jx poppler-0.8.0/poppler-0.8.0/poppler/OptionalContent.cc
--- poppler-0.8.0/poppler-0.8.0/poppler/OptionalContent.cc.jx	2008-03-14 20:24:54.000000000 -0400
+++ poppler-0.8.0/poppler-0.8.0/poppler/OptionalContent.cc	2008-04-06 18:56:06.000000000 -0400
@@ -162,6 +162,8 @@ OptionalContentGroup* OCGs::findOcgByRef
 {
   //TODO: make this more efficient
   OptionalContentGroup *ocg = NULL;
+  if (!optionalContentGroups)
+    return NULL;
   for (int i=0; i < optionalContentGroups->getLength(); ++i) {
     ocg = (OptionalContentGroup*)optionalContentGroups->get(i);
     if ( (ocg->ref().num == ref.num) && (ocg->ref().gen == ref.gen) ) {
@@ -208,7 +210,7 @@ bool OCGs::optContentIsVisible( Object *
       }
     } else if (ocg.isRef()) {
       OptionalContentGroup* oc = findOcgByRef( ocg.getRef() );      
-      if ( oc->state() == OptionalContentGroup::Off ) {
+      if ( !oc || oc->state() == OptionalContentGroup::Off ) {
 	result = false;
       } else {
 	result = true ;
@@ -218,11 +220,8 @@ bool OCGs::optContentIsVisible( Object *
     policy.free();
   } else if ( dictType.isName("OCG") ) {
     OptionalContentGroup* oc = findOcgByRef( dictRef->getRef() );
-    if ( oc ) {
-//       printf("Found valid group object\n");
-      if ( oc->state() == OptionalContentGroup::Off ) {
-	result=false;
-      }
+    if ( !oc || oc->state() == OptionalContentGroup::Off ) {
+      result=false;
     }
   } 
   dictType.free();
@@ -253,6 +252,8 @@ bool OCGs::allOff( Array *ocgArray )
     ocgArray->getNF(i, &ocgItem);
     if (ocgItem.isRef()) {
       OptionalContentGroup* oc = findOcgByRef( ocgItem.getRef() );      
+      if (!oc)
+	  continue;
       if ( oc->state() == OptionalContentGroup::On ) {
 	return false;
       }
@@ -268,6 +269,8 @@ bool OCGs::anyOn( Array *ocgArray )
     ocgArray->getNF(i, &ocgItem);
     if (ocgItem.isRef()) {
       OptionalContentGroup* oc = findOcgByRef( ocgItem.getRef() );      
+      if (!oc)
+	  continue;
       if ( oc->state() == OptionalContentGroup::On ) {
 	return true;
       }
@@ -283,6 +286,8 @@ bool OCGs::anyOff( Array *ocgArray )
     ocgArray->getNF(i, &ocgItem);
     if (ocgItem.isRef()) {
       OptionalContentGroup* oc = findOcgByRef( ocgItem.getRef() );      
+      if (!oc)
+	  continue;
       if ( oc->state() == OptionalContentGroup::Off ) {
 	return true;
       }