diff -up ImageMagick-6.9.10-68/coders/svg.c.freeze ImageMagick-6.9.10-68/coders/svg.c

--- ImageMagick-6.9.10-68/coders/svg.c.freeze	2019-11-11 12:30:05.611595848 +0100

+++ ImageMagick-6.9.10-68/coders/svg.c	2019-11-11 12:28:36.574295494 +0100

@@ -1679,6 +1679,12 @@ static void SVGStartElement(void *contex

                       value);

                     break;

                   }

+		else 

+		  {

+		    // empty class name

+                    (void) FormatLocaleFile(svg_info->file,"class \"\"\n");

+                    break;

+		  }

               }

               break;

             }