CVE-2018-19532: Null pointer dereference vulnerability in PdfTranslator::setTarget() - podofo 0.9.6

Gdb : 
gef➤  p page 
$53 = (PoDoFo::PdfPage *) 0x82a2d30 
gef➤  p *page 
$56 = { 
   = { 
    _vptr.PdfElement = 0x822b4c0, 
    m_pObject = 0x82a5f78 
  }, 
   = { 
    _vptr.PdfCanvas = 0x822b504  
  }, 
  members of PoDoFo::PdfPage: 
  m_pContents = 0x82a7870, 
  m_pResources = 0x82a8870, 
  m_mapAnnotations = std::map with 0 elements, 
  m_mapAnnotationsDirect = std::map with 0 elements
  

Source code :
for (int i = 0; i GetPage ( i );  
PdfMemoryOutputStream outMemStream ( 1 );  
PdfXObject *xobj = new PdfXObject ( page->GetMediaBox(), targetDoc );  
if ( page->GetContents()->HasStream() )  
{  
page->GetContents()->GetStream()->GetFilteredCopy ( &outMemStream );  
}

GDB : 
 
259                                     PdfXObject *xobj = new PdfXObject ( page->GetMediaBox(), targetDoc ); 
1: page = (PoDoFo::PdfPage *) 0x0 
[ Legend: Modified register | Code | Heap | Stack | String ] 
────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── registers ──── 
$eax   : 0x0 
$ebx   : 0x082a9de4  →  0x082aa7f0  →  0x08219b78  →  0x0813d594  →   push ebp 
$ecx   : 0x3 
$edx   : 0x082aaef0  →  0x00000000 
$esp   : 0xbffff470  →  0xb7bab000  →  0x00172664 
$ebp   : 0xbffff528  →  0xbffff568  →  0x00000000 
$esi   : 0xbffff4d8  →  0x00000000 
$edi   : 0xb7a16000  →  0x001b1db0 
$eip   : 0x0811bd62  →  GetMediaBox(), targetDoc ); 
    260                                 if ( page->GetContents()->HasStream() ) 
    261                                 { 
    262                                         page->GetContents()->GetStream()->GetFilteredCopy ( &outMemStream ); 
    263                                 } 
    264                                 else if ( page->GetContents()->IsArray() ) 
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── threads ──── 
[#0] Id 1, Name: "podofoimpose", stopped, reason: BREAKPOINT 
────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── trace ──── 
[#0] 0x811bd62 → PoDoFo::Impose::PdfTranslator::setTarget(this=0x82a1c48, target="test") 
[#1] 0x8119af1 → main(argc=0x4, argv=0xbffff614) 
 
gef➤  p page 
$58 = (PoDoFo::PdfPage *) 0x0 
gef➤  p *page 
Cannot access memory at address 0x0 
gef➤  i r 
eax            0x0      0x0 
ecx            0x3      0x3 
edx            0x82aaef0        0x82aaef0 
ebx            0x82a9de4        0x82a9de4 
esp            0xbffff470       0xbffff470 
ebp            0xbffff528       0xbffff528 
esi            0xbffff4d8       0xbffff4d8 
edi            0xb7a16000       0xb7a16000 
eip            0x811bd62        0x811bd62  const&)+320> 
eflags         0x200282 [ SF IF ID ] 
cs             0x73     0x73 
ss             0x7b     0x7b 
ds             0x7b     0x7b 
es             0x7b     0x7b 
fs             0x0      0x0 
gs             0x33     0x33 

gef➤  bt
#0  0x0811bd68 in PoDoFo::Impose::PdfTranslator::setTarget (this=0x82a1c70, target="test.pdf") at /home/loginsoft/podofo-code-r1949-podofo-trunk/tools/podofoimpose/pdftranslator.cpp:259
#1  0x08119af1 in main (argc=0x4, argv=0xbffff604) at /home/loginsoft/podofo-code-r1949-podofo-trunk/tools/podofoimpose/podofoimpose.cpp:108