skip errors in pdf processor

lib/pdf_processor.rb

@@ -25,6 +25,11 @@ class PdfProcessor < HexaPDF::Content::Processor
         @pos += 1
       end
 
+      @pos = 0
+      @num += 1
+    rescue HexaPDF::Error => e
+      Rails.logger.error(e.message)
+
       @pos = 0
       @num += 1
     end