diff -wrupN podofo-0.9.6/tools/podofoimgextract/ImageExtractor.cpp podofo-0.9.6-new/tools/podofoimgextract/ImageExtractor.cpp
--- podofo-0.9.6/tools/podofoimgextract/ImageExtractor.cpp	2018-02-25 12:48:38.000000000 +0100
+++ podofo-0.9.6-new/tools/podofoimgextract/ImageExtractor.cpp	2020-01-17 19:43:48.619699851 +0100
@@ -117,6 +117,11 @@ void ImageExtractor::ExtractImage( PdfOb
         //long lBitsPerComponent = pObject->GetDictionary().GetKey( PdfName("BitsPerComponent" ) )->GetNumber();
         // TODO: Handle colorspaces
 
+        if ( !pObject->GetDictionary().HasKey( PdfName("Width" ) ) || !pObject->GetDictionary().HasKey( PdfName("Height" ) ) )
+        {
+            PODOFO_RAISE_ERROR( ePdfError_BrokenFile );
+        }
+
         // Create a ppm image
         const char* pszPpmHeader = "P6\n# Image extracted by PoDoFo\n%" PDF_FORMAT_INT64 " %" PDF_FORMAT_INT64 "\n%li\n";